$$ \begin{aligned} (\frac{2}{3})^{-3}(\frac{3}{4})^2 &= x&& \text{multiply ALL terms by } \color{blue}{ 12 }. \\[1 em]12(\frac{2}{3})^{-3}(\frac{3}{4})^2 &= 12x&& \text{cancel out the denominators} \\[1 em]0 &= 12x&& \text{ swap the left and right side of the equation } \\[1 em]12x &= 0&& \text{ divide both sides by $ 12 $ } \\[1 em]x &= \frac{0}{12}&& \\[1 em]x &= 0&& \\[1 em] \end{aligned} $$

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