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2.50+4.25b=21.25
We move all terms to the left:
2.50+4.25b-(21.25)=0
We add all the numbers together, and all the variables
4.25b-18.75=0
We move all terms containing b to the left, all other terms to the right
4.25b=18.75
b=18.75/4.25
b=4+1/2.4285714285714
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