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