$$ \begin{aligned} 4(2n-5) &= 3n+10&& \text{simplify left side} \\[1 em]8n-20 &= 3n+10&& \text{move the $ \color{blue}{ 3n } $ to the left side and $ \color{blue}{ -20 }$ to the right} \\[1 em]8n-3n &= 10+20&& \text{simplify left and right hand side} \\[1 em]5n &= 30&& \text{ divide both sides by $ 5 $ } \\[1 em]n &= \frac{30}{5}&& \\[1 em]n &= 6&& \\[1 em] \end{aligned} $$

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