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