$$ \begin{aligned} 5(x-1) &= 20(x+10)&& \text{simplify left and right hand side} \\[1 em]5x-5 &= 20x+200&& \text{move the $ \color{blue}{ 20x } $ to the left side and $ \color{blue}{ -5 }$ to the right} \\[1 em]5x-20x &= 200+5&& \text{simplify left and right hand side} \\[1 em]-15x &= 205&& \text{ divide both sides by $ -15 $ } \\[1 em]x &= -\frac{205}{15}&& \\[1 em]x &= -\frac{41}{3}&& \\[1 em] \end{aligned} $$

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