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15=f/2+12
We move all terms to the left:
15-(f/2+12)=0
We get rid of parentheses
-f/2-12+15=0
We multiply all the terms by the denominator
-f-12*2+15*2=0
We add all the numbers together, and all the variables
-1f+6=0
We move all terms containing f to the left, all other terms to the right
-f=-6
f=-6/-1
f=+6
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