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4=3+f
We move all terms to the left:
4-(3+f)=0
We add all the numbers together, and all the variables
-(f+3)+4=0
We get rid of parentheses
-f-3+4=0
We add all the numbers together, and all the variables
-1f+1=0
We move all terms containing f to the left, all other terms to the right
-f=-1
f=-1/-1
f=1
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