Question
$$25+5a = 5+10a$$
Answer
$$ a = 4 $$
Explanation
$$ \begin{aligned} 25+5a &= 5+10a&& \text{move the $ \color{blue}{ 10a } $ to the left side and $ \color{blue}{ 25 }$ to the right} \\[1 em]5a-10a &= 5-25&& \text{simplify left and right hand side} \\[1 em]-5a &= -20&& \text{ divide both sides by $ -5 $ } \\[1 em]a &= \frac{-20}{-5}&& \\[1 em]a &= 4&& \\[1 em] \end{aligned} $$
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