$$ \begin{aligned} 4y+7-3y &= 8y+31&& \text{simplify left side} \\[1 em]y+7 &= 8y+31&& \text{move the $ \color{blue}{ 8y } $ to the left side and $ \color{blue}{ 7 }$ to the right} \\[1 em]y-8y &= 31-7&& \text{simplify left and right hand side} \\[1 em]-7y &= 24&& \text{ divide both sides by $ -7 $ } \\[1 em]y &= -\frac{24}{7}&& \\[1 em] \end{aligned} $$

This page was created using