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=50+(20+7)B
We move all terms to the left:
-(50+(20+7)B)=0
We add all the numbers together, and all the variables
-(50+27B)=0
We get rid of parentheses
-27B-50=0
We move all terms containing B to the left, all other terms to the right
-27B=50
B=50/-27
B=-1+23/27
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