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12.50+42.50b=3
We move all terms to the left:
12.50+42.50b-(3)=0
We add all the numbers together, and all the variables
42.50b+9.5=0
We move all terms containing b to the left, all other terms to the right
42.50b=-9.5
b=-9.5/42.50
b=-2.7142857142857/12.142857142857
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