Question
$$\frac{x}{9}+16 = 20$$
Answer
$$ x = 36 $$
Explanation
$$ \begin{aligned} \frac{x}{9}+16 &= 20&& \text{multiply ALL terms by } \color{blue}{ 9 }. \\[1 em]9 \cdot \frac{x}{9}+9\cdot16 &= 9\cdot20&& \text{cancel out the denominators} \\[1 em]x+144 &= 180&& \text{ move 144 to the right } \\[1 em]x &= 180-144&& \\[1 em]x &= 36&& \\[1 em]x &= 36&& \\[1 em] \end{aligned} $$
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