$$\frac{1}{2}x+13 = 9$$
Answer
$$ x = -8 $$
Explanation
$$ \begin{aligned} \frac{1}{2}x+13 &= 9&& \text{multiply ALL terms by } \color{blue}{ 2 }. \\[1 em]2 \cdot \frac{1}{2}x+2\cdot13 &= 2\cdot9&& \text{cancel out the denominators} \\[1 em]x+26 &= 18&& \text{ move 26 to the right } \\[1 em]x &= 18-26&& \\[1 em]x &= -8&& \\[1 em]x &= -8&& \\[1 em] \end{aligned} $$
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