Question
$$3 \cdot \frac{f}{3} = 257$$
Answer
$$ f = 257 $$
Explanation
$$ \begin{aligned} 3 \cdot \frac{f}{3} &= 257&& \text{multiply ALL terms by } \color{blue}{ 3 }. \\[1 em]3\cdot3 \cdot \frac{f}{3} &= 3\cdot257&& \text{cancel out the denominators} \\[1 em]3f &= 771&& \text{ divide both sides by $ 3 $ } \\[1 em]f &= \frac{771}{3}&& \\[1 em]f &= 257&& \\[1 em] \end{aligned} $$
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