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f/2+7=15
We move all terms to the left:
f/2+7-(15)=0
We add all the numbers together, and all the variables
f/2-8=0
We multiply all the terms by the denominator
f-8*2=0
We add all the numbers together, and all the variables
f-16=0
We move all terms containing f to the left, all other terms to the right
f=16
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