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f/8-15=-12
We move all terms to the left:
f/8-15-(-12)=0
We add all the numbers together, and all the variables
f/8-3=0
We multiply all the terms by the denominator
f-3*8=0
We add all the numbers together, and all the variables
f-24=0
We move all terms containing f to the left, all other terms to the right
f=24
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