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

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