$$ \begin{aligned} y-\frac{28}{7} &= 0&& \text{multiply ALL terms by } \color{blue}{ 7 }. \\[1 em]7y-7\cdot\frac{28}{7} &= 7\cdot0&& \text{cancel out the denominators} \\[1 em]7y-28 &= 0&& \text{ move the constants to the right } \\[1 em]7y &= 28&& \text{ divide both sides by $ 7 $ } \\[1 em]y &= \frac{28}{7}&& \\[1 em]y &= 4&& \\[1 em] \end{aligned} $$

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