Question
$$\frac{a}{5}+4 = 3$$
Answer
$$ a = -5 $$
Explanation
$$ \begin{aligned} \frac{a}{5}+4 &= 3&& \text{multiply ALL terms by } \color{blue}{ 5 }. \\[1 em]5 \cdot \frac{a}{5}+5\cdot4 &= 5\cdot3&& \text{cancel out the denominators} \\[1 em]a+20 &= 15&& \text{ move 20 to the right } \\[1 em]a &= 15-20&& \\[1 em]a &= -5&& \\[1 em]a &= -5&& \\[1 em] \end{aligned} $$
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