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12.9b=85.14
We move all terms to the left:
12.9b-(85.14)=0
We add all the numbers together, and all the variables
12.9b-85.14=0
We move all terms containing b to the left, all other terms to the right
12.9b=85.14
b=85.14/12.9
b=6+4.448275862069/7.4137931034483
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