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=2000-100B
We move all terms to the left:
-(2000-100B)=0
We add all the numbers together, and all the variables
-(-100B+2000)=0
We get rid of parentheses
100B-2000=0
We move all terms containing B to the left, all other terms to the right
100B=2000
B=2000/100
B=20
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