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9=3(f-13)
We move all terms to the left:
9-(3(f-13))=0
We calculate terms in parentheses: -(3(f-13)), so:We get rid of parentheses
3(f-13)
We multiply parentheses
3f-39
Back to the equation:
-(3f-39)
-3f+39+9=0
We add all the numbers together, and all the variables
-3f+48=0
We move all terms containing f to the left, all other terms to the right
-3f=-48
f=-48/-3
f=+16
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