$$ \begin{aligned} 12 &= -2(x-10)&& \text{simplify right side} \\[1 em]12 &= -(2x-20)&& \\[1 em]12 &= -2x+20&& \text{ swap the left and right side of the equation } \\[1 em]-2x+20 &= 12&& \text{ move 20 to the right } \\[1 em]-2x &= 12-20&& \\[1 em]-2x &= -8&& \text{ divide both sides by $ -2 $ } \\[1 em]x &= \frac{-8}{-2}&& \\[1 em]x &= 4&& \\[1 em] \end{aligned} $$

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