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30.75b=-72.8
We move all terms to the left:
30.75b-(-72.8)=0
We add all the numbers together, and all the variables
30.75b+72.8=0
We move all terms containing b to the left, all other terms to the right
30.75b=-72.8
b=-72.8/30.75
b=-2+8.6923076923077/23.653846153846
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