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39(f-3)=-15
We move all terms to the left:
39(f-3)-(-15)=0
We add all the numbers together, and all the variables
39(f-3)+15=0
We multiply parentheses
39f-117+15=0
We add all the numbers together, and all the variables
39f-102=0
We move all terms containing f to the left, all other terms to the right
39f=102
f=102/39
f=2+8/13
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