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5(7f-)=28(f-1)
We move all terms to the left:
5(7f-)-(28(f-1))=0
We add all the numbers together, and all the variables
5(+7f)-(28(f-1))=0
We multiply parentheses
35f-(28(f-1))=0
We calculate terms in parentheses: -(28(f-1)), so:We get rid of parentheses
28(f-1)
We multiply parentheses
28f-28
Back to the equation:
-(28f-28)
35f-28f+28=0
We add all the numbers together, and all the variables
7f+28=0
We move all terms containing f to the left, all other terms to the right
7f=-28
f=-28/7
f=-4
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