$$ \begin{aligned} -1-3u+11u &= -14+9u&& \text{simplify left and right hand side} \\[1 em]8u-1 &= 9u-14&& \text{move the $ \color{blue}{ 9u } $ to the left side and $ \color{blue}{ -1 }$ to the right} \\[1 em]8u-9u &= -14+1&& \text{simplify left and right hand side} \\[1 em]-u &= -13&& \text{switch signs on both sides} \\[1 em]u &= 13&& \\[1 em] \end{aligned} $$

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