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20=f+1.1
We move all terms to the left:
20-(f+1.1)=0
We get rid of parentheses
-f-1.1+20=0
We add all the numbers together, and all the variables
-1f+18.9=0
We move all terms containing f to the left, all other terms to the right
-f=-18.9
f=-18.9/-1
f=18+0.9/1
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