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4+2f=-2(-f-2)
We move all terms to the left:
4+2f-(-2(-f-2))=0
We add all the numbers together, and all the variables
2f-(-2(-1f-2))+4=0
We calculate terms in parentheses: -(-2(-1f-2)), so:We get rid of parentheses
-2(-1f-2)
We multiply parentheses
2f+4
Back to the equation:
-(2f+4)
2f-2f-4+4=0
We add all the numbers together, and all the variables
=0
f=0/1
f=0
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