$$ \begin{aligned} -6(a+2) &= 3(4a+2)&& \text{simplify left and right hand side} \\[1 em]-(6a+12) &= 12a+6&& \\[1 em]-6a-12 &= 12a+6&& \text{move the $ \color{blue}{ 12a } $ to the left side and $ \color{blue}{ -12 }$ to the right} \\[1 em]-6a-12a &= 6+12&& \text{simplify left and right hand side} \\[1 em]-18a &= 18&& \text{ divide both sides by $ -18 $ } \\[1 em]a &= -\frac{18}{18}&& \\[1 em]a &= -1&& \\[1 em] \end{aligned} $$

This page was created using