$$ \begin{aligned} \frac{x}{2}-1 &= 3&& \text{multiply ALL terms by } \color{blue}{ 2 }. \\[1 em]2 \cdot \frac{x}{2}-2\cdot1 &= 2\cdot3&& \text{cancel out the denominators} \\[1 em]x-2 &= 6&& \text{ move -2 to the right } \\[1 em]x &= 6+2&& \\[1 em]x &= 8&& \\[1 em]x &= 8&& \\[1 em] \end{aligned} $$
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