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-2f=-9f+7f
We move all terms to the left:
-2f-(-9f+7f)=0
We add all the numbers together, and all the variables
-2f-(-2f)=0
We get rid of parentheses
-2f+2f=0
We add all the numbers together, and all the variables
=0
f=0/1
f=0
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