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