Question
$$f-4 = 6f+26$$
Answer
$$ f = -6 $$
Explanation
$$ \begin{aligned} f-4 &= 6f+26&& \text{move the $ \color{blue}{ 6f } $ to the left side and $ \color{blue}{ -4 }$ to the right} \\[1 em]f-6f &= 26+4&& \text{simplify left and right hand side} \\[1 em]-5f &= 30&& \text{ divide both sides by $ -5 $ } \\[1 em]f &= -\frac{30}{5}&& \\[1 em]f &= -6&& \\[1 em] \end{aligned} $$
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