$$5-x = 2x-25$$
Answer
$$ x = 10 $$
Explanation
$$ \begin{aligned} 5-x &= 2x-25&& \text{move the $ \color{blue}{ 2x } $ to the left side and $ \color{blue}{ 5 }$ to the right} \\[1 em]-x-2x &= -25-5&& \text{simplify left and right hand side} \\[1 em]-3x &= -30&& \text{ divide both sides by $ -3 $ } \\[1 em]x &= \frac{-30}{-3}&& \\[1 em]x &= 10&& \\[1 em] \end{aligned} $$
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