https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-equations-and-inequalities/cc-6th-solving-equations/v/why-we-do-the-same-thing-to-both-sides-simple-equations 2023-06-14T19:01:04.581019455Z Same thing to both sides of equations In this fun math problem, we have a balanced scale with a mystery mass on one side and several 1-kilogram masses on the other. To find the mystery mass, we remove the same number of 1-kilogram masses from both sides, keeping the scale balanced. Then, we can easily determine the mystery mass's weight. Sal Khan video https://cdn.kastatic.org/googleusercontent/mDbW5Kliflbv-kdPwZxHt6-TvT7sOetoTp5u49jMZCRw9jyGA5dZTjuSAJVsBfLD_oEbnP_nBWgEloxxDS0uDGA Same thing to both sides of equations In this fun math problem, we have a balanced scale with a mystery mass on one side and several 1-kilogram masses on the other. To find the mystery mass, we remove the same number of 1-kilogram masses from both sides, keeping the scale balanced. Then, we can easily determine the mystery mass's weight. https://cdn.kastatic.org/ka-youtube-converted/5FBDqY41GjU.mp4/5FBDqY41GjU.mp4 152 Two-step equations intro https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-variables-expressions/cc-7th-2-step-equations-intro/v/why-we-do-the-same-thing-to-both-sides-two-step-equations 2021-06-30T17:51:06Z Intro to two-step equations Here's how we solve a two step equation. It begins with the concept of equality: what we do to one side of the equation must be done to the other. Sal Khan video https://cdn.kastatic.org/googleusercontent/1CtT2vJ4JJfK95E2SUf73hnHef_-xVncH65qOj-RpXf_fjQFHf-keZJbTiFMCgUEXnsVwo7Mkk_y0bhYQHTGtiU Intro to two-step equations Here's how we solve a two step equation. It begins with the concept of equality: what we do to one side of the equation must be done to the other. https://cdn.kastatic.org/ka-youtube-converted/_y_Q3_B2Vh8.mp4/_y_Q3_B2Vh8.mp4 312 Two-step equations intro https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-variables-expressions/cc-7th-2-step-equations-intro/v/equations-2 2021-06-30T17:51:10Z Two-step equations intuition This example demonstrates how we solve an equation expressed such: ax + b = c. It's a little more complicated than previous examples, but you can do it! Sal Khan video https://cdn.kastatic.org/googleusercontent/fhfJcX0akEsX-lYbisyU41_xI0AAzP6OcslEfiHnur3jBunIWP09MwxpDvjblYILw9afVlkvYpFXxhKfuDPnbM0 Two-step equations intuition This example demonstrates how we solve an equation expressed such: ax + b = c. It's a little more complicated than previous examples, but you can do it! https://cdn.kastatic.org/ka-youtube-converted/XoEn1LfVoTo.mp4/XoEn1LfVoTo.mp4 521 Two-step equations intro https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-variables-expressions/cc-7th-2-step-equations-intro/v/solving-equations-1 2021-07-02T09:35:26Z Worked example: two-step equations Sal solves the equation -16 = x/4 + 2. It takes two steps because he first has to subtract 2 from both sides and then multiply both sides by 4. Sal Khan video https://cdn.kastatic.org/googleusercontent/QiQDNq5ahsYhEPD2KUZf0gHE_x7EOwZEYq-Ys14iWgUO6WfMFybttVgho_KS2aRfNTpI0sPMGmDqImTBt7u7pEQ Worked example: two-step equations Sal solves the equation -16 = x/4 + 2. It takes two steps because he first has to subtract 2 from both sides and then multiply both sides by 4. https://cdn.kastatic.org/ka-youtube-converted/p5e5mf_G3FI.mp4/p5e5mf_G3FI.mp4 184 Two-step equations intro https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-variables-expressions/cc-7th-2-step-equations-intro/e/linear_equations_2 2026-06-25T23:50:45.984016225Z Two-step equations Practice solving equations that take two steps to solve. For example, solve  -16 = x/4 + 2. Ben Alpert exercise