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12b-(-9b)+(-2)=19
We move all terms to the left:
12b-(-9b)+(-2)-(19)=0
determiningTheFunctionDomain 12b-(-9b)-19+(-2)=0
We add all the numbers together, and all the variables
12b-(-9b)-21=0
We get rid of parentheses
12b+9b-21=0
We add all the numbers together, and all the variables
21b-21=0
We move all terms containing b to the left, all other terms to the right
21b=21
b=21/21
b=1
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