Question
$$3f-6 = 9f$$
Answer
$$ f = -1 $$
Explanation
$$ \begin{aligned} 3f-6 &= 9f&& \text{move the $ \color{blue}{ 9f } $ to the left side and $ \color{blue}{ -6 }$ to the right} \\[1 em]3f-9f &= 6&& \text{simplify left side} \\[1 em]-6f &= 6&& \text{ divide both sides by $ -6 $ } \\[1 em]f &= -\frac{6}{6}&& \\[1 em]f &= -1&& \\[1 em] \end{aligned} $$
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