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-12.1f+12.91=12.91-12.1f
We move all terms to the left:
-12.1f+12.91-(12.91-12.1f)=0
We add all the numbers together, and all the variables
-12.1f-(-12.1f+12.91)+12.91=0
We get rid of parentheses
-12.1f+12.1f-12.91+12.91=0
We add all the numbers together, and all the variables
=0
f=0/1
f=0
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