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3.7b=8.1b-19.4
We move all terms to the left:
3.7b-(8.1b-19.4)=0
We get rid of parentheses
3.7b-8.1b+19.4=0
We add all the numbers together, and all the variables
-4.4b+19.4=0
We move all terms containing b to the left, all other terms to the right
-4.4b=-19.4
b=-19.4/-4.4
b=4+1/2.44444444444
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