$$ \begin{aligned} x-\frac{1}{5} &= \frac{7}{4}&& \text{multiply ALL terms by } \color{blue}{ 20 }. \\[1 em]20x-20\cdot\frac{1}{5} &= 20\cdot\frac{7}{4}&& \text{cancel out the denominators} \\[1 em]20x-4 &= 35&& \text{ move -4 to the right } \\[1 em]20x &= 35+4&& \\[1 em]20x &= 39&& \text{ divide both sides by $ 20 $ } \\[1 em]x &= \frac{39}{20}&& \\[1 em] \end{aligned} $$

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