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-12f+18=-11f+18-f
We move all terms to the left:
-12f+18-(-11f+18-f)=0
We add all the numbers together, and all the variables
-12f-(-12f+18)+18=0
We get rid of parentheses
-12f+12f-18+18=0
We add all the numbers together, and all the variables
=0
f=0/1
f=0
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