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4f-4=2f+4
We move all terms to the left:
4f-4-(2f+4)=0
We get rid of parentheses
4f-2f-4-4=0
We add all the numbers together, and all the variables
2f-8=0
We move all terms containing f to the left, all other terms to the right
2f=8
f=8/2
f=4
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