Question
$$\frac{f\cdot4}{3} = 12$$
Answer
$$ f = 9 $$
Explanation
$$ \begin{aligned} \frac{f\cdot4}{3} &= 12&& \text{multiply ALL terms by } \color{blue}{ 3 }. \\[1 em]3 \cdot \frac{f\cdot4}{3} &= 3\cdot12&& \text{cancel out the denominators} \\[1 em]4f &= 36&& \text{ divide both sides by $ 4 $ } \\[1 em]f &= \frac{36}{4}&& \\[1 em]f &= 9&& \\[1 em] \end{aligned} $$
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