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3=-2f+-23
We move all terms to the left:
3-(-2f+-23)=0
We add all the numbers together, and all the variables
-(-2f-23)+3=0
We get rid of parentheses
2f+23+3=0
We add all the numbers together, and all the variables
2f+26=0
We move all terms containing f to the left, all other terms to the right
2f=-26
f=-26/2
f=-13
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