$$5x\cdot(18-13) = 20+\frac{20}{4}$$

$$ \begin{aligned} 5x\cdot(18-13) &= 20+\frac{20}{4}&& \text{multiply ALL terms by } \color{blue}{ 4 }. \\[1 em]45x\cdot(18-13) &= 4\cdot20+4\cdot\frac{20}{4}&& \text{cancel out the denominators} \\[1 em]100x &= 80+20&& \text{simplify right side} \\[1 em]100x &= 100&& \text{ divide both sides by $ 100 $ } \\[1 em]x &= \frac{100}{100}&& \\[1 em]x &= 1&& \\[1 em] \end{aligned} $$

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