$$ \begin{aligned} \frac{x}{5}+6-2 &= 42&& \text{multiply ALL terms by } \color{blue}{ 5 }. \\[1 em]5 \cdot \frac{x}{5}+5\cdot6-5\cdot2 &= 5\cdot42&& \text{cancel out the denominators} \\[1 em]x+30-10 &= 210&& \text{simplify left side} \\[1 em]x+20 &= 210&& \text{ move 20 to the right } \\[1 em]x &= 210-20&& \\[1 em]x &= 190&& \\[1 em]x &= 190&& \\[1 em] \end{aligned} $$

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