$$ \begin{aligned} 60a+64 &= 80a-92&& \text{move the $ \color{blue}{ 80a } $ to the left side and $ \color{blue}{ 64 }$ to the right} \\[1 em]60a-80a &= -92-64&& \text{simplify left and right hand side} \\[1 em]-20a &= -156&& \text{ divide both sides by $ -20 $ } \\[1 em]a &= \frac{-156}{-20}&& \\[1 em]a &= \frac{39}{5}&& \\[1 em] \end{aligned} $$

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