$$ \begin{aligned} -\frac{3}{4} &= 7x&& \text{multiply ALL terms by } \color{blue}{ 4 }. \\[1 em]-4\cdot\frac{3}{4} &= 4\cdot7x&& \text{cancel out the denominators} \\[1 em]-3 &= 28x&& \text{ swap the left and right side of the equation } \\[1 em]28x &= -3&& \text{ divide both sides by $ 28 $ } \\[1 em]x &= -\frac{3}{28}&& \\[1 em] \end{aligned} $$

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