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4(f-1)=45
We move all terms to the left:
4(f-1)-(45)=0
We multiply parentheses
4f-4-45=0
We add all the numbers together, and all the variables
4f-49=0
We move all terms containing f to the left, all other terms to the right
4f=49
f=49/4
f=12+1/4
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