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3f+8f+(-9f)=2f
We move all terms to the left:
3f+8f+(-9f)-(2f)=0
We add all the numbers together, and all the variables
9f+(-9f)=0
We get rid of parentheses
9f-9f=0
We add all the numbers together, and all the variables
=0
f=0/1
f=0
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