$$ \begin{aligned} 8+4x &= \frac{393}{5}&& \text{multiply ALL terms by } \color{blue}{ 5 }. \\[1 em]5\cdot8+5\cdot4x &= 5\cdot\frac{393}{5}&& \text{cancel out the denominators} \\[1 em]40+20x &= 393&& \text{ move 40 to the right } \\[1 em]20x &= 393-40&& \\[1 em]20x &= 353&& \text{ divide both sides by $ 20 $ } \\[1 em]x &= \frac{353}{20}&& \\[1 em] \end{aligned} $$

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