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-5=f-(-7)
We move all terms to the left:
-5-(f-(-7))=0
We calculate terms in parentheses: -(f-(-7)), so:We get rid of parentheses
f-(-7)
We add all the numbers together, and all the variables
f+7
Back to the equation:
-(f+7)
-f-7-5=0
We add all the numbers together, and all the variables
-1f-12=0
We move all terms containing f to the left, all other terms to the right
-f=12
f=12/-1
f=-12
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