$$ \begin{aligned} -\frac{5}{9} &= \frac{16}{x}&& \text{multiply ALL terms by } \color{blue}{ 9x }. \\[1 em]-9x\cdot\frac{5}{9} &= 9x\cdot\frac{16}{x}&& \text{cancel out the denominators} \\[1 em]-5x &= 144&& \text{ divide both sides by $ -5 $ } \\[1 em]x &= -\frac{144}{5}&& \\[1 em] \end{aligned} $$
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