$$5-\frac{r}{4} = \frac{1}{4}$$

$$ \begin{aligned} 5-\frac{r}{4} &= \frac{1}{4}&& \text{multiply ALL terms by } \color{blue}{ 4 }. \\[1 em]4\cdot5-4 \cdot \frac{r}{4} &= 4\cdot\frac{1}{4}&& \text{cancel out the denominators} \\[1 em]20-r &= 1&& \text{ move 20 to the right } \\[1 em]-r &= 1-20&& \\[1 em]-r &= -19&& \text{switch signs on both sides} \\[1 em]r &= 19&& \\[1 em] \end{aligned} $$

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