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2.8b-7.1=1.3
We move all terms to the left:
2.8b-7.1-(1.3)=0
We add all the numbers together, and all the variables
2.8b-8.4=0
We move all terms containing b to the left, all other terms to the right
2.8b=8.4
b=8.4/2.8
b=3+1.7763568394003E-15/2.8
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