Question
$$-7 = \frac{w}{10}$$
Answer
$$ w = -70 $$
Explanation
$$ \begin{aligned} -7 &= \frac{w}{10}&& \text{multiply ALL terms by } \color{blue}{ 10 }. \\[1 em]10\cdot(-7) &= 10 \cdot \frac{w}{10}&& \text{cancel out the denominators} \\[1 em]-70 &= w&& \text{ swap the left and right side of the equation } \\[1 em]w &= -70&& \\[1 em]w &= -70&& \\[1 em] \end{aligned} $$
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