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27=2f-3
We move all terms to the left:
27-(2f-3)=0
We get rid of parentheses
-2f+3+27=0
We add all the numbers together, and all the variables
-2f+30=0
We move all terms containing f to the left, all other terms to the right
-2f=-30
f=-30/-2
f=+15
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