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90=6(f+1)
We move all terms to the left:
90-(6(f+1))=0
We calculate terms in parentheses: -(6(f+1)), so:We get rid of parentheses
6(f+1)
We multiply parentheses
6f+6
Back to the equation:
-(6f+6)
-6f-6+90=0
We add all the numbers together, and all the variables
-6f+84=0
We move all terms containing f to the left, all other terms to the right
-6f=-84
f=-84/-6
f=+14
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