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4=f/(-4)
We move all terms to the left:
4-(f/(-4))=0
We multiply all the terms by the denominator
-(f+4*(-4))=0
We calculate terms in parentheses: -(f+4*(-4)), so:We get rid of parentheses
f+4*(-4)
We add all the numbers together, and all the variables
f-16
Back to the equation:
-(f-16)
-f+16=0
We add all the numbers together, and all the variables
-1f+16=0
We move all terms containing f to the left, all other terms to the right
-f=-16
f=-16/-1
f=+16
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