Question
$$\frac{r}{4}-12 = -5$$
Answer
$$ r = 28 $$
Explanation
$$ \begin{aligned} \frac{r}{4}-12 &= -5&& \text{multiply ALL terms by } \color{blue}{ 4 }. \\[1 em]4 \cdot \frac{r}{4}-4\cdot12 &= 4\cdot(-5)&& \text{cancel out the denominators} \\[1 em]r-48 &= -20&& \text{ move -48 to the right } \\[1 em]r &= -20+48&& \\[1 em]r &= 28&& \\[1 em]r &= 28&& \\[1 em] \end{aligned} $$
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