Question
$$\frac{x}{3}+7 = 19$$
Answer
$$ x = 36 $$
Explanation
$$ \begin{aligned} \frac{x}{3}+7 &= 19&& \text{multiply ALL terms by } \color{blue}{ 3 }. \\[1 em]3 \cdot \frac{x}{3}+3\cdot7 &= 3\cdot19&& \text{cancel out the denominators} \\[1 em]x+21 &= 57&& \text{ move 21 to the right } \\[1 em]x &= 57-21&& \\[1 em]x &= 36&& \\[1 em]x &= 36&& \\[1 em] \end{aligned} $$
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