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=75+(20+7)B
We move all terms to the left:
-(75+(20+7)B)=0
We add all the numbers together, and all the variables
-(75+27B)=0
We get rid of parentheses
-27B-75=0
We move all terms containing B to the left, all other terms to the right
-27B=75
B=75/-27
B=-2+7/9
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