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3(f+1)-4=5
We move all terms to the left:
3(f+1)-4-(5)=0
We add all the numbers together, and all the variables
3(f+1)-9=0
We multiply parentheses
3f+3-9=0
We add all the numbers together, and all the variables
3f-6=0
We move all terms containing f to the left, all other terms to the right
3f=6
f=6/3
f=2
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