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30=2(b-48)
We move all terms to the left:
30-(2(b-48))=0
We calculate terms in parentheses: -(2(b-48)), so:We get rid of parentheses
2(b-48)
We multiply parentheses
2b-96
Back to the equation:
-(2b-96)
-2b+96+30=0
We add all the numbers together, and all the variables
-2b+126=0
We move all terms containing b to the left, all other terms to the right
-2b=-126
b=-126/-2
b=+63
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