$$ \begin{aligned} \frac{x}{4}-2 &= 3&& \text{multiply ALL terms by } \color{blue}{ 4 }. \\[1 em]4 \cdot \frac{x}{4}-4\cdot2 &= 4\cdot3&& \text{cancel out the denominators} \\[1 em]x-8 &= 12&& \text{ move -8 to the right } \\[1 em]x &= 12+8&& \\[1 em]x &= 20&& \\[1 em]x &= 20&& \\[1 em] \end{aligned} $$
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