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-5f=2f-7f
We move all terms to the left:
-5f-(2f-7f)=0
We add all the numbers together, and all the variables
-5f-(-5f)=0
We get rid of parentheses
-5f+5f=0
We add all the numbers together, and all the variables
=0
f=0/1
f=0
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