Question
$$5x-10 = 4x+20$$
Answer
$$ x = 30 $$
Explanation
$$ \begin{aligned} 5x-10 &= 4x+20&& \text{move the $ \color{blue}{ 4x } $ to the left side and $ \color{blue}{ -10 }$ to the right} \\[1 em]5x-4x &= 20+10&& \text{simplify left and right hand side} \\[1 em]x &= 30&& \\[1 em]x &= 30&& \\[1 em] \end{aligned} $$
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