Question
$$25u+74 = 23u+92$$
Answer
$$ u = 9 $$
Explanation
$$ \begin{aligned} 25u+74 &= 23u+92&& \text{move the $ \color{blue}{ 23u } $ to the left side and $ \color{blue}{ 74 }$ to the right} \\[1 em]25u-23u &= 92-74&& \text{simplify left and right hand side} \\[1 em]2u &= 18&& \text{ divide both sides by $ 2 $ } \\[1 em]u &= \frac{18}{2}&& \\[1 em]u &= 9&& \\[1 em] \end{aligned} $$
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