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