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-7f-1=2f-1+1-f
We move all terms to the left:
-7f-1-(2f-1+1-f)=0
We add all the numbers together, and all the variables
-7f-(+f)-1=0
We get rid of parentheses
-7f-f-1=0
We add all the numbers together, and all the variables
-8f-1=0
We move all terms containing f to the left, all other terms to the right
-8f=1
f=1/-8
f=-1/8
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