$$ \begin{aligned} 2 \cdot \frac{y}{7}-\frac{7}{8} &= 25&& \text{multiply ALL terms by } \color{blue}{ 56 }. \\[1 em]56\cdot2 \cdot \frac{y}{7}-56\cdot\frac{7}{8} &= 56\cdot25&& \text{cancel out the denominators} \\[1 em]16y-49 &= 1400&& \text{ move -49 to the right } \\[1 em]16y &= 1400+49&& \\[1 em]16y &= 1449&& \text{ divide both sides by $ 16 $ } \\[1 em]y &= \frac{1449}{16}&& \\[1 em] \end{aligned} $$

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