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13*b=84.5
We move all terms to the left:
13*b-(84.5)=0
We add all the numbers together, and all the variables
13b-84.5=0
We move all terms containing b to the left, all other terms to the right
13b=84.5
b=84.5/13
b=6+4.3333333333333/8.6666666666667
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