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98=7(f+1)
We move all terms to the left:
98-(7(f+1))=0
We calculate terms in parentheses: -(7(f+1)), so:We get rid of parentheses
7(f+1)
We multiply parentheses
7f+7
Back to the equation:
-(7f+7)
-7f-7+98=0
We add all the numbers together, and all the variables
-7f+91=0
We move all terms containing f to the left, all other terms to the right
-7f=-91
f=-91/-7
f=+13
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