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-5=2f+-1
We move all terms to the left:
-5-(2f+-1)=0
We add all the numbers together, and all the variables
-(2f-1)-5=0
We get rid of parentheses
-2f+1-5=0
We add all the numbers together, and all the variables
-2f-4=0
We move all terms containing f to the left, all other terms to the right
-2f=4
f=4/-2
f=-2
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