$$ \begin{aligned} 4\cdot(5+8x) &= 20-4x&& \text{simplify left and right hand side} \\[1 em]20+32x &= -4x+20&& \\[1 em]32x+20 &= -4x+20&& \text{move the $ \color{blue}{ -4x } $ to the left side and $ \color{blue}{ 20 }$ to the right} \\[1 em]32x+4x &= 20-20&& \text{simplify left and right hand side} \\[1 em]36x &= 0&& \text{ divide both sides by $ 36 $ } \\[1 em]x &= \frac{0}{36}&& \\[1 em]x &= 0&& \\[1 em] \end{aligned} $$

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