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12.5b+1.75b=9
We move all terms to the left:
12.5b+1.75b-(9)=0
We add all the numbers together, and all the variables
14.25b-9=0
We move all terms containing b to the left, all other terms to the right
14.25b=9
b=9/14.25
b=9/14.25
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