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9=-4b-5b
We move all terms to the left:
9-(-4b-5b)=0
We add all the numbers together, and all the variables
-(-9b)+9=0
We get rid of parentheses
9b+9=0
We move all terms containing b to the left, all other terms to the right
9b=-9
b=-9/9
b=-1
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