Problem

Carly tried to solve an equation step by step.
4(7j+2)=107j+2=40Step 17j=42Step 2j=6Step 3\qquad\begin{aligned} -4(7j+2)&=10\\\\ \\ 7j+2&=-40&\green{\text{Step } 1}\\\\ \\ 7j&=-42&\blue{\text{Step } 2}\\\\ \\ j&=-6&\purple{\text{Step } 3}\\\\ \end{aligned}
Find Carly's mistake.
Please choose from one of the following options.