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f/3+-12=-13
We move all terms to the left:
f/3+-12-(-13)=0
We add all the numbers together, and all the variables
f/3+1=0
We multiply all the terms by the denominator
f+1*3=0
We add all the numbers together, and all the variables
f+3=0
We move all terms containing f to the left, all other terms to the right
f=-3
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