Question
$$\frac{s}{3}+9 = 10$$
Answer
$$ s = 3 $$
Explanation
$$ \begin{aligned} \frac{s}{3}+9 &= 10&& \text{multiply ALL terms by } \color{blue}{ 3 }. \\[1 em]3 \cdot \frac{s}{3}+3\cdot9 &= 3\cdot10&& \text{cancel out the denominators} \\[1 em]s+27 &= 30&& \text{ move 27 to the right } \\[1 em]s &= 30-27&& \\[1 em]s &= 3&& \\[1 em]s &= 3&& \\[1 em] \end{aligned} $$
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