$$ \begin{aligned} \frac{x}{3}+19 &= 22&& \text{multiply ALL terms by } \color{blue}{ 3 }. \\[1 em]3 \cdot \frac{x}{3}+3\cdot19 &= 3\cdot22&& \text{cancel out the denominators} \\[1 em]x+57 &= 66&& \text{ move 57 to the right } \\[1 em]x &= 66-57&& \\[1 em]x &= 9&& \\[1 em]x &= 9&& \\[1 em] \end{aligned} $$
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