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### Course: Pre-algebra>Unit 7

Lesson 5: Finding mistakes in one-step equations

# Finding mistakes in one-step equations

In this lesson, we learned how to spot mistakes in solving algebraic equations. We saw that it's crucial to apply the same operation to both sides of the equation. We also learned the importance of accurate arithmetic in getting the correct answer. Lastly, we saw that not all steps, even if algebraically correct, help simplify the equation.

## Want to join the conversation?

• Question. Why would it matter if you got step one wrong if you got step 2 right?
• I guess it's because teachers want us to do everything right the first time, and while you may get lucky to get the correct answer, in the end, it's the work that mainly counts and you may not get lucky every time on step two. :/
• Why are almost all the mess ups on step one?
• I don't know. Maybe it is because you are most likely to mess up on step one?? I don't really know, this is just a guess.
• During the final question, Taylor's equation, how did Sal calculate N-5.4=4? I can't follow the process to how he achieved that, even though it is an example of being incorrect.
• On the 2nd problem, you said that whatever you do to the right/left hand side, you do to the left/right hand side, but instead of multiplying by 1/3, couldn't you just divide by 1/3 instead? Any thoughts?
• I'm a little confused as to what you mean, but if I gather correctly you are referring to dividing g/3 = 4/3?
• At , or, in the entire video, the way that the problems are done is different from the way I would do the problems. This makes it insanely hard to find the mistake because I wouldn't do the problem that way! Is there any way or "trick" to finding mistakes in these problems?!
(1 vote)
• theres is 2 question needs to be FIXED!
(1 vote)
• At , the beginning of the video Sal said 7 times a, or 7 x a.
Why would I have to do that?
And then also in step one how do you get the same answer in both equations?
Would not sometimes the equations have different answers?