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18=f+2.3
We move all terms to the left:
18-(f+2.3)=0
We get rid of parentheses
-f-2.3+18=0
We add all the numbers together, and all the variables
-1f+15.7=0
We move all terms containing f to the left, all other terms to the right
-f=-15.7
f=-15.7/-1
f=15+0.7/1
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