$$\frac{1}{5}x-4 = 3$$
Answer
$$ x = 35 $$
Explanation
$$ \begin{aligned} \frac{1}{5}x-4 &= 3&& \text{multiply ALL terms by } \color{blue}{ 5 }. \\[1 em]5 \cdot \frac{1}{5}x-5\cdot4 &= 5\cdot3&& \text{cancel out the denominators} \\[1 em]x-20 &= 15&& \text{ move -20 to the right } \\[1 em]x &= 15+20&& \\[1 em]x &= 35&& \\[1 em]x &= 35&& \\[1 em] \end{aligned} $$
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