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-12=15+3f
We move all terms to the left:
-12-(15+3f)=0
We add all the numbers together, and all the variables
-(3f+15)-12=0
We get rid of parentheses
-3f-15-12=0
We add all the numbers together, and all the variables
-3f-27=0
We move all terms containing f to the left, all other terms to the right
-3f=27
f=27/-3
f=-9
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