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91=7(f-81)
We move all terms to the left:
91-(7(f-81))=0
We calculate terms in parentheses: -(7(f-81)), so:We get rid of parentheses
7(f-81)
We multiply parentheses
7f-567
Back to the equation:
-(7f-567)
-7f+567+91=0
We add all the numbers together, and all the variables
-7f+658=0
We move all terms containing f to the left, all other terms to the right
-7f=-658
f=-658/-7
f=+94
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