Question
$$7+f = 4f+1$$
Answer
$$ f = 2 $$
Explanation
$$ \begin{aligned} 7+f &= 4f+1&& \text{move the $ \color{blue}{ 4f } $ to the left side and $ \color{blue}{ 7 }$ to the right} \\[1 em]f-4f &= 1-7&& \text{simplify left and right hand side} \\[1 em]-3f &= -6&& \text{ divide both sides by $ -3 $ } \\[1 em]f &= \frac{-6}{-3}&& \\[1 em]f &= 2&& \\[1 em] \end{aligned} $$
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