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8.5f+17=8.3f+19
We move all terms to the left:
8.5f+17-(8.3f+19)=0
We get rid of parentheses
8.5f-8.3f-19+17=0
We add all the numbers together, and all the variables
0.2f-2=0
We move all terms containing f to the left, all other terms to the right
0.2f=2
f=2/0.2
f=10
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