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6(b+3)=3b+30
We move all terms to the left:
6(b+3)-(3b+30)=0
We multiply parentheses
6b-(3b+30)+18=0
We get rid of parentheses
6b-3b-30+18=0
We add all the numbers together, and all the variables
3b-12=0
We move all terms containing b to the left, all other terms to the right
3b=12
b=12/3
b=4
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