Question
$$11+5u = -7+3u$$
Answer
$$ u = -9 $$
Explanation
$$ \begin{aligned} 11+5u &= -7+3u&& \text{move the $ \color{blue}{ 3u } $ to the left side and $ \color{blue}{ 11 }$ to the right} \\[1 em]5u-3u &= -7-11&& \text{simplify left and right hand side} \\[1 em]2u &= -18&& \text{ divide both sides by $ 2 $ } \\[1 em]u &= -\frac{18}{2}&& \\[1 em]u &= -9&& \\[1 em] \end{aligned} $$
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