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-31=-6f+8f
We move all terms to the left:
-31-(-6f+8f)=0
We add all the numbers together, and all the variables
-(+2f)-31=0
We get rid of parentheses
-2f-31=0
We move all terms containing f to the left, all other terms to the right
-2f=31
f=31/-2
f=-15+1/2
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