$$ \begin{aligned} 5x-4 &= 2x+11&& \text{move the $ \color{blue}{ 2x } $ to the left side and $ \color{blue}{ -4 }$ to the right} \\[1 em]5x-2x &= 11+4&& \text{simplify left and right hand side} \\[1 em]3x &= 15&& \text{ divide both sides by $ 3 $ } \\[1 em]x &= \frac{15}{3}&& \\[1 em]x &= 5&& \\[1 em] \end{aligned} $$
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