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-b+19=-3b-19
We move all terms to the left:
-b+19-(-3b-19)=0
We add all the numbers together, and all the variables
-1b-(-3b-19)+19=0
We get rid of parentheses
-1b+3b+19+19=0
We add all the numbers together, and all the variables
2b+38=0
We move all terms containing b to the left, all other terms to the right
2b=-38
b=-38/2
b=-19
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