Question
$$-\frac{6}{5} = \frac{x}{15}$$
Answer
$$ x = -18 $$
Explanation
$$ \begin{aligned} -\frac{6}{5} &= \frac{x}{15}&& \text{multiply ALL terms by } \color{blue}{ 15 }. \\[1 em]-15\cdot\frac{6}{5} &= 15 \cdot \frac{x}{15}&& \text{cancel out the denominators} \\[1 em]-18 &= x&& \text{ swap the left and right side of the equation } \\[1 em]x &= -18&& \\[1 em]x &= -18&& \\[1 em] \end{aligned} $$
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