$$ \begin{aligned} 36+5n &= -3(n+4)&& \text{simplify left and right hand side} \\[1 em]5n+36 &= -(3n+12)&& \\[1 em]5n+36 &= -3n-12&& \text{move the $ \color{blue}{ -3n } $ to the left side and $ \color{blue}{ 36 }$ to the right} \\[1 em]5n+3n &= -12-36&& \text{simplify left and right hand side} \\[1 em]8n &= -48&& \text{ divide both sides by $ 8 $ } \\[1 em]n &= -\frac{48}{8}&& \\[1 em]n &= -6&& \\[1 em] \end{aligned} $$

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