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2+9b=-18+7b

We move all terms to the left:

2+9b-(-18+7b)=0

We add all the numbers together, and all the variables

9b-(7b-18)+2=0

We get rid of parentheses

9b-7b+18+2=0

We add all the numbers together, and all the variables

2b+20=0

We move all terms containing b to the left, all other terms to the right

2b=-20

b=-20/2

b=-10

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