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-8.65=f-16.9
We move all terms to the left:
-8.65-(f-16.9)=0
We get rid of parentheses
-f+16.9-8.65=0
We add all the numbers together, and all the variables
-1f+8.25=0
We move all terms containing f to the left, all other terms to the right
-f=-8.25
f=-8.25/-1
f=8+0.25/1
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