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10.5f=13.16+19.9f
We move all terms to the left:
10.5f-(13.16+19.9f)=0
We add all the numbers together, and all the variables
10.5f-(19.9f+13.16)=0
We get rid of parentheses
10.5f-19.9f-13.16=0
We add all the numbers together, and all the variables
-9.4f-13.16=0
We move all terms containing f to the left, all other terms to the right
-9.4f=13.16
f=13.16/-9.4
f=-1+1/2.5
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