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6b+9+2(6b+9)=477
We move all terms to the left:
6b+9+2(6b+9)-(477)=0
We add all the numbers together, and all the variables
6b+2(6b+9)-468=0
We multiply parentheses
6b+12b+18-468=0
We add all the numbers together, and all the variables
18b-450=0
We move all terms containing b to the left, all other terms to the right
18b=450
b=450/18
b=25
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