Question
$$4-\frac{1}{2}x = 0$$
Answer
$$ x = 8 $$
Explanation
$$ \begin{aligned} 4-\frac{1}{2}x &= 0&& \text{multiply ALL terms by } \color{blue}{ 2 }. \\[1 em]2\cdot4-2 \cdot \frac{1}{2}x &= 2\cdot0&& \text{cancel out the denominators} \\[1 em]8-x &= 0&& \text{ move the constants to the right } \\[1 em]-x &= -8&& \text{switch signs on both sides} \\[1 em]x &= 8&& \\[1 em] \end{aligned} $$
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