Question
$$\frac{1}{2}x+15 = 18$$
Answer
$$ x = 6 $$
Explanation
$$ \begin{aligned} \frac{1}{2}x+15 &= 18&& \text{multiply ALL terms by } \color{blue}{ 2 }. \\[1 em]2 \cdot \frac{1}{2}x+2\cdot15 &= 2\cdot18&& \text{cancel out the denominators} \\[1 em]x+30 &= 36&& \text{ move 30 to the right } \\[1 em]x &= 36-30&& \\[1 em]x &= 6&& \\[1 em]x &= 6&& \\[1 em] \end{aligned} $$
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