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=85+(25+7)B
We move all terms to the left:
-(85+(25+7)B)=0
We add all the numbers together, and all the variables
-(85+32B)=0
We get rid of parentheses
-32B-85=0
We move all terms containing B to the left, all other terms to the right
-32B=85
B=85/-32
B=-2+21/32
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