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-15.89+8.3f=12.8f+19.66
We move all terms to the left:
-15.89+8.3f-(12.8f+19.66)=0
We get rid of parentheses
8.3f-12.8f-19.66-15.89=0
We add all the numbers together, and all the variables
-4.5f-35.55=0
We move all terms containing f to the left, all other terms to the right
-4.5f=35.55
f=35.55/-4.5
f=-7+1/1.1111111111111
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