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-3f+4=4-3f
We move all terms to the left:
-3f+4-(4-3f)=0
We add all the numbers together, and all the variables
-3f-(-3f+4)+4=0
We get rid of parentheses
-3f+3f-4+4=0
We add all the numbers together, and all the variables
=0
f=0/1
f=0
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