Question
$$5r-4 = r+20$$
Answer
$$ r = 6 $$
Explanation
$$ \begin{aligned} 5r-4 &= r+20&& \text{move the $ \color{blue}{ r } $ to the left side and $ \color{blue}{ -4 }$ to the right} \\[1 em]5r-r &= 20+4&& \text{simplify left and right hand side} \\[1 em]4r &= 24&& \text{ divide both sides by $ 4 $ } \\[1 em]r &= \frac{24}{4}&& \\[1 em]r &= 6&& \\[1 em] \end{aligned} $$
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