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-15+13f=-15+17f-4f
We move all terms to the left:
-15+13f-(-15+17f-4f)=0
We add all the numbers together, and all the variables
13f-(13f-15)-15=0
We get rid of parentheses
13f-13f+15-15=0
We add all the numbers together, and all the variables
=0
f=0/1
f=0
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