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2f+1=-f+4
We move all terms to the left:
2f+1-(-f+4)=0
We add all the numbers together, and all the variables
2f-(-1f+4)+1=0
We get rid of parentheses
2f+1f-4+1=0
We add all the numbers together, and all the variables
3f-3=0
We move all terms containing f to the left, all other terms to the right
3f=3
f=3/3
f=1
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