Question
$$\frac{n}{4}-1 = 2$$
Answer
$$ n = 12 $$
Explanation
$$ \begin{aligned} \frac{n}{4}-1 &= 2&& \text{multiply ALL terms by } \color{blue}{ 4 }. \\[1 em]4 \cdot \frac{n}{4}-4\cdot1 &= 4\cdot2&& \text{cancel out the denominators} \\[1 em]n-4 &= 8&& \text{ move -4 to the right } \\[1 em]n &= 8+4&& \\[1 em]n &= 12&& \\[1 em]n &= 12&& \\[1 em] \end{aligned} $$
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