$$ \begin{aligned} 4+10f &= 7(2f-4)&& \text{simplify left and right hand side} \\[1 em]10f+4 &= 14f-28&& \text{move the $ \color{blue}{ 14f } $ to the left side and $ \color{blue}{ 4 }$ to the right} \\[1 em]10f-14f &= -28-4&& \text{simplify left and right hand side} \\[1 em]-4f &= -32&& \text{ divide both sides by $ -4 $ } \\[1 em]f &= \frac{-32}{-4}&& \\[1 em]f &= 8&& \\[1 em] \end{aligned} $$

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