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f/2-7=-1
We move all terms to the left:
f/2-7-(-1)=0
We add all the numbers together, and all the variables
f/2-6=0
We multiply all the terms by the denominator
f-6*2=0
We add all the numbers together, and all the variables
f-12=0
We move all terms containing f to the left, all other terms to the right
f=12
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