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-12=-3+f
We move all terms to the left:
-12-(-3+f)=0
We add all the numbers together, and all the variables
-(f-3)-12=0
We get rid of parentheses
-f+3-12=0
We add all the numbers together, and all the variables
-1f-9=0
We move all terms containing f to the left, all other terms to the right
-f=9
f=9/-1
f=-9
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