Question
$$25-4x = x$$
Answer
$$ x = 5 $$
Explanation
$$ \begin{aligned} 25-4x &= x&& \text{move the $ \color{blue}{ x } $ to the left side and $ \color{blue}{ 25 }$ to the right} \\[1 em]-4x-x &= -25&& \text{simplify left side} \\[1 em]-5x &= -25&& \text{ divide both sides by $ -5 $ } \\[1 em]x &= \frac{-25}{-5}&& \\[1 em]x &= 5&& \\[1 em] \end{aligned} $$
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