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27=2f+15
We move all terms to the left:
27-(2f+15)=0
We get rid of parentheses
-2f-15+27=0
We add all the numbers together, and all the variables
-2f+12=0
We move all terms containing f to the left, all other terms to the right
-2f=-12
f=-12/-2
f=+6
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