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-9(b-89)=-9
We move all terms to the left:
-9(b-89)-(-9)=0
We add all the numbers together, and all the variables
-9(b-89)+9=0
We multiply parentheses
-9b+801+9=0
We add all the numbers together, and all the variables
-9b+810=0
We move all terms containing b to the left, all other terms to the right
-9b=-810
b=-810/-9
b=+90
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