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9.50-b=13.50
We move all terms to the left:
9.50-b-(13.50)=0
We add all the numbers together, and all the variables
-b+9.50-(13.5)=0
We add all the numbers together, and all the variables
-1b-4=0
We move all terms containing b to the left, all other terms to the right
-b=4
b=4/-1
b=-4
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