$$ \begin{aligned} -\frac{85}{9} &= \frac{42}{3}w&& \text{multiply ALL terms by } \color{blue}{ 9 }. \\[1 em]-9\cdot\frac{85}{9} &= 9 \cdot \frac{42}{3}w&& \text{cancel out the denominators} \\[1 em]-85 &= 126w&& \text{ swap the left and right side of the equation } \\[1 em]126w &= -85&& \text{ divide both sides by $ 126 $ } \\[1 em]w &= -\frac{85}{126}&& \\[1 em] \end{aligned} $$

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