Question
$$-\frac{3}{7}x = 21$$
Answer
$$ x = -49 $$
Explanation
$$ \begin{aligned} -\frac{3}{7}x &= 21&& \text{multiply ALL terms by } \color{blue}{ 7 }. \\[1 em]-7 \cdot \frac{3}{7}x &= 7\cdot21&& \text{cancel out the denominators} \\[1 em]-3x &= 147&& \text{ divide both sides by $ -3 $ } \\[1 em]x &= -\frac{147}{3}&& \\[1 em]x &= -49&& \\[1 em] \end{aligned} $$
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