Question
$$\frac{1}{3}x+5 = 13$$
Answer
$$ x = 24 $$
Explanation
$$ \begin{aligned} \frac{1}{3}x+5 &= 13&& \text{multiply ALL terms by } \color{blue}{ 3 }. \\[1 em]3 \cdot \frac{1}{3}x+3\cdot5 &= 3\cdot13&& \text{cancel out the denominators} \\[1 em]x+15 &= 39&& \text{ move 15 to the right } \\[1 em]x &= 39-15&& \\[1 em]x &= 24&& \\[1 em]x &= 24&& \\[1 em] \end{aligned} $$
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