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3+f/3=-15
We move all terms to the left:
3+f/3-(-15)=0
We add all the numbers together, and all the variables
f/3+18=0
We multiply all the terms by the denominator
f+18*3=0
We add all the numbers together, and all the variables
f+54=0
We move all terms containing f to the left, all other terms to the right
f=-54
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