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