$$ \begin{aligned} x+\frac{7}{8} &= \frac{3}{4}&& \text{multiply ALL terms by } \color{blue}{ 8 }. \\[1 em]8x+8\cdot\frac{7}{8} &= 8\cdot\frac{3}{4}&& \text{cancel out the denominators} \\[1 em]8x+7 &= 6&& \text{ move 7 to the right } \\[1 em]8x &= 6-7&& \\[1 em]8x &= -1&& \text{ divide both sides by $ 8 $ } \\[1 em]x &= -\frac{1}{8}&& \\[1 em] \end{aligned} $$

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