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20=2(b+10)
We move all terms to the left:
20-(2(b+10))=0
We calculate terms in parentheses: -(2(b+10)), so:We get rid of parentheses
2(b+10)
We multiply parentheses
2b+20
Back to the equation:
-(2b+20)
-2b-20+20=0
We add all the numbers together, and all the variables
-2b=0
b=0/-2
b=0
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