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1b+9(1b+1)=109
We move all terms to the left:
1b+9(1b+1)-(109)=0
We add all the numbers together, and all the variables
1b+9(b+1)-109=0
We add all the numbers together, and all the variables
b+9(b+1)-109=0
We multiply parentheses
b+9b+9-109=0
We add all the numbers together, and all the variables
10b-100=0
We move all terms containing b to the left, all other terms to the right
10b=100
b=100/10
b=10
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