$$16(x-1) = 12x+36$$

$$ \begin{aligned} 16(x-1) &= 12x+36&& \text{simplify left side} \\[1 em]16x-16 &= 12x+36&& \text{move the $ \color{blue}{ 12x } $ to the left side and $ \color{blue}{ -16 }$ to the right} \\[1 em]16x-12x &= 36+16&& \text{simplify left and right hand side} \\[1 em]4x &= 52&& \text{ divide both sides by $ 4 $ } \\[1 em]x &= \frac{52}{4}&& \\[1 em]x &= 13&& \\[1 em] \end{aligned} $$

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