$$ \begin{aligned} 1+8x+9 &= -20+2x&& \text{simplify left and right hand side} \\[1 em]8x+10 &= 2x-20&& \text{move the $ \color{blue}{ 2x } $ to the left side and $ \color{blue}{ 10 }$ to the right} \\[1 em]8x-2x &= -20-10&& \text{simplify left and right hand side} \\[1 em]6x &= -30&& \text{ divide both sides by $ 6 $ } \\[1 em]x &= -\frac{30}{6}&& \\[1 em]x &= -5&& \\[1 em] \end{aligned} $$

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