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-3=(f-12)/(-2)
We move all terms to the left:
-3-((f-12)/(-2))=0
We multiply all the terms by the denominator
-((f-12)-3*(-2))=0
We calculate terms in parentheses: -((f-12)-3*(-2)), so:We get rid of parentheses
(f-12)-3*(-2)
We add all the numbers together, and all the variables
(f-12)+6
We get rid of parentheses
f-12+6
We add all the numbers together, and all the variables
f-6
Back to the equation:
-(f-6)
-f+6=0
We add all the numbers together, and all the variables
-1f+6=0
We move all terms containing f to the left, all other terms to the right
-f=-6
f=-6/-1
f=+6
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