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4f-5=7(f-5)
We move all terms to the left:
4f-5-(7(f-5))=0
We calculate terms in parentheses: -(7(f-5)), so:We get rid of parentheses
7(f-5)
We multiply parentheses
7f-35
Back to the equation:
-(7f-35)
4f-7f+35-5=0
We add all the numbers together, and all the variables
-3f+30=0
We move all terms containing f to the left, all other terms to the right
-3f=-30
f=-30/-3
f=+10
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