Question
$$\frac{x}{2}+5 = 9$$
Answer
$$ x = 8 $$
Explanation
$$ \begin{aligned} \frac{x}{2}+5 &= 9&& \text{multiply ALL terms by } \color{blue}{ 2 }. \\[1 em]2 \cdot \frac{x}{2}+2\cdot5 &= 2\cdot9&& \text{cancel out the denominators} \\[1 em]x+10 &= 18&& \text{ move 10 to the right } \\[1 em]x &= 18-10&& \\[1 em]x &= 8&& \\[1 em]x &= 8&& \\[1 em] \end{aligned} $$
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