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9+10b=-9b-10
We move all terms to the left:
9+10b-(-9b-10)=0
We get rid of parentheses
10b+9b+10+9=0
We add all the numbers together, and all the variables
19b+19=0
We move all terms containing b to the left, all other terms to the right
19b=-19
b=-19/19
b=-1
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