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-1=-(f-15)
We move all terms to the left:
-1-(-(f-15))=0
We calculate terms in parentheses: -(-(f-15)), so:We get rid of parentheses
-(f-15)
We get rid of parentheses
-f+15
We add all the numbers together, and all the variables
-1f+15
Back to the equation:
-(-1f+15)
1f-15-1=0
We add all the numbers together, and all the variables
f-16=0
We move all terms containing f to the left, all other terms to the right
f=16
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