Question
$$\frac{x+20}{2} = 15$$
Answer
$$ x = 10 $$
Explanation
$$ \begin{aligned} \frac{x+20}{2} &= 15&& \text{multiply ALL terms by } \color{blue}{ 2 }. \\[1 em]2 \cdot \frac{x+20}{2} &= 2\cdot15&& \text{cancel out the denominators} \\[1 em]x+20 &= 30&& \text{ move 20 to the right } \\[1 em]x &= 30-20&& \\[1 em]x &= 10&& \\[1 em]x &= 10&& \\[1 em] \end{aligned} $$
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