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2b=(b+30)
We move all terms to the left:
2b-((b+30))=0
We calculate terms in parentheses: -((b+30)), so:We get rid of parentheses
(b+30)
We get rid of parentheses
b+30
Back to the equation:
-(b+30)
2b-b-30=0
We add all the numbers together, and all the variables
b-30=0
We move all terms containing b to the left, all other terms to the right
b=30
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