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15=3(f-6)
We move all terms to the left:
15-(3(f-6))=0
We calculate terms in parentheses: -(3(f-6)), so:We get rid of parentheses
3(f-6)
We multiply parentheses
3f-18
Back to the equation:
-(3f-18)
-3f+18+15=0
We add all the numbers together, and all the variables
-3f+33=0
We move all terms containing f to the left, all other terms to the right
-3f=-33
f=-33/-3
f=+11
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