$$ \begin{aligned} \frac{18}{21}x\cdot\frac{7}{16} &= -12+4&& \text{multiply ALL terms by } \color{blue}{ 336 }. \\[1 em]336 \cdot \frac{18}{21}x\cdot\frac{7}{16} &= -336\cdot12+336\cdot4&& \text{cancel out the denominators} \\[1 em]126x &= -4032+1344&& \text{simplify right side} \\[1 em]126x &= -2688&& \text{ divide both sides by $ 126 $ } \\[1 em]x &= -\frac{2688}{126}&& \\[1 em]x &= -\frac{64}{3}&& \\[1 em] \end{aligned} $$

This page was created using