Question
$$\frac{x}{2}+21 = 36$$
Answer
$$ x = 30 $$
Explanation
$$ \begin{aligned} \frac{x}{2}+21 &= 36&& \text{multiply ALL terms by } \color{blue}{ 2 }. \\[1 em]2 \cdot \frac{x}{2}+2\cdot21 &= 2\cdot36&& \text{cancel out the denominators} \\[1 em]x+42 &= 72&& \text{ move 42 to the right } \\[1 em]x &= 72-42&& \\[1 em]x &= 30&& \\[1 em]x &= 30&& \\[1 em] \end{aligned} $$
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