$$ \begin{aligned} 64-x &= 18+12x+20&& \text{simplify left and right hand side} \\[1 em]-x+64 &= 12x+38&& \text{move the $ \color{blue}{ 12x } $ to the left side and $ \color{blue}{ 64 }$ to the right} \\[1 em]-x-12x &= 38-64&& \text{simplify left and right hand side} \\[1 em]-13x &= -26&& \text{ divide both sides by $ -13 $ } \\[1 em]x &= \frac{-26}{-13}&& \\[1 em]x &= 2&& \\[1 em] \end{aligned} $$

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