Question
$$-10 = -\frac{1}{2}x$$
Answer
$$ x = 20 $$
Explanation
$$ \begin{aligned} -10 &= -\frac{1}{2}x&& \text{multiply ALL terms by } \color{blue}{ 2 }. \\[1 em]2\cdot(-10) &= -2 \cdot \frac{1}{2}x&& \text{cancel out the denominators} \\[1 em]-20 &= -x&& \text{ swap the left and right side of the equation } \\[1 em]-x &= -20&& \text{switch signs on both sides} \\[1 em]x &= 20&& \\[1 em] \end{aligned} $$
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