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f/12=-3
We move all terms to the left:
f/12-(-3)=0
We add all the numbers together, and all the variables
f/12+3=0
We multiply all the terms by the denominator
f+3*12=0
We add all the numbers together, and all the variables
f+36=0
We move all terms containing f to the left, all other terms to the right
f=-36
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