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-2-7f=-5f
We move all terms to the left:
-2-7f-(-5f)=0
We get rid of parentheses
-7f+5f-2=0
We add all the numbers together, and all the variables
-2f-2=0
We move all terms containing f to the left, all other terms to the right
-2f=2
f=2/-2
f=-1
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