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6(b-3)+15=57
We move all terms to the left:
6(b-3)+15-(57)=0
We add all the numbers together, and all the variables
6(b-3)-42=0
We multiply parentheses
6b-18-42=0
We add all the numbers together, and all the variables
6b-60=0
We move all terms containing b to the left, all other terms to the right
6b=60
b=60/6
b=10
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