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9b/20-3=15
We move all terms to the left:
9b/20-3-(15)=0
We add all the numbers together, and all the variables
9b/20-18=0
We multiply all the terms by the denominator
9b-18*20=0
We add all the numbers together, and all the variables
9b-360=0
We move all terms containing b to the left, all other terms to the right
9b=360
b=360/9
b=40
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