Question
$$\frac{1}{2}x+10 = 0$$
Answer
$$ x = -20 $$
Explanation
$$ \begin{aligned} \frac{1}{2}x+10 &= 0&& \text{multiply ALL terms by } \color{blue}{ 2 }. \\[1 em]2 \cdot \frac{1}{2}x+2\cdot10 &= 2\cdot0&& \text{cancel out the denominators} \\[1 em]x+20 &= 0&& \text{ move the constants to the right } \\[1 em]x &= -20&& \\[1 em]x &= -20&& \\[1 em] \end{aligned} $$
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