Question
$$36-2x = x$$
Answer
$$ x = 12 $$
Explanation
$$ \begin{aligned} 36-2x &= x&& \text{move the $ \color{blue}{ x } $ to the left side and $ \color{blue}{ 36 }$ to the right} \\[1 em]-2x-x &= -36&& \text{simplify left side} \\[1 em]-3x &= -36&& \text{ divide both sides by $ -3 $ } \\[1 em]x &= \frac{-36}{-3}&& \\[1 em]x &= 12&& \\[1 em] \end{aligned} $$
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