$$ \begin{aligned} 3(2x+12) &= 20(x-1)&& \text{simplify left and right hand side} \\[1 em]6x+36 &= 20x-20&& \text{move the $ \color{blue}{ 20x } $ to the left side and $ \color{blue}{ 36 }$ to the right} \\[1 em]6x-20x &= -20-36&& \text{simplify left and right hand side} \\[1 em]-14x &= -56&& \text{ divide both sides by $ -14 $ } \\[1 em]x &= \frac{-56}{-14}&& \\[1 em]x &= 4&& \\[1 em] \end{aligned} $$

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