$$ \begin{aligned} -17 &= \frac{2}{3}r&& \text{multiply ALL terms by } \color{blue}{ 3 }. \\[1 em]3\cdot(-17) &= 3 \cdot \frac{2}{3}r&& \text{cancel out the denominators} \\[1 em]-51 &= 2r&& \text{ swap the left and right side of the equation } \\[1 em]2r &= -51&& \text{ divide both sides by $ 2 $ } \\[1 em]r &= -\frac{51}{2}&& \\[1 em] \end{aligned} $$

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