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2.4b-9.1b+12.5b=-39.44
We move all terms to the left:
2.4b-9.1b+12.5b-(-39.44)=0
We add all the numbers together, and all the variables
5.8b+39.44=0
We move all terms containing b to the left, all other terms to the right
5.8b=-39.44
b=-39.44/5.8
b=-6+2.8292682926829/3.5365853658537
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