Question
$$\frac{1}{5}x-20 = 0$$
Answer
$$ x = 100 $$
Explanation
$$ \begin{aligned} \frac{1}{5}x-20 &= 0&& \text{multiply ALL terms by } \color{blue}{ 5 }. \\[1 em]5 \cdot \frac{1}{5}x-5\cdot20 &= 5\cdot0&& \text{cancel out the denominators} \\[1 em]x-100 &= 0&& \text{ move the constants to the right } \\[1 em]x &= 100&& \\[1 em]x &= 100&& \\[1 em] \end{aligned} $$
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