$$ \begin{aligned} 16+19x+15 &= 71-x&& \text{simplify left and right hand side} \\[1 em]19x+31 &= -x+71&& \text{move the $ \color{blue}{ -x } $ to the left side and $ \color{blue}{ 31 }$ to the right} \\[1 em]19x+x &= 71-31&& \text{simplify left and right hand side} \\[1 em]20x &= 40&& \text{ divide both sides by $ 20 $ } \\[1 em]x &= \frac{40}{20}&& \\[1 em]x &= 2&& \\[1 em] \end{aligned} $$

This page was created using