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4=2f+2
We move all terms to the left:
4-(2f+2)=0
We get rid of parentheses
-2f-2+4=0
We add all the numbers together, and all the variables
-2f+2=0
We move all terms containing f to the left, all other terms to the right
-2f=-2
f=-2/-2
f=1
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