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f/2-15=-12
We move all terms to the left:
f/2-15-(-12)=0
We add all the numbers together, and all the variables
f/2-3=0
We multiply all the terms by the denominator
f-3*2=0
We add all the numbers together, and all the variables
f-6=0
We move all terms containing f to the left, all other terms to the right
f=6
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