Question
$$13-4x = 1-x$$
Answer
$$ x = 4 $$
Explanation
$$ \begin{aligned} 13-4x &= 1-x&& \text{move the $ \color{blue}{ -x } $ to the left side and $ \color{blue}{ 13 }$ to the right} \\[1 em]-4x+x &= 1-13&& \text{simplify left and right hand side} \\[1 em]-3x &= -12&& \text{ divide both sides by $ -3 $ } \\[1 em]x &= \frac{-12}{-3}&& \\[1 em]x &= 4&& \\[1 em] \end{aligned} $$
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