b^2 - 4b = 6b^2 =11 b
15b = -5b^2
5b^2 = -15b
b^2 = -3b
0; -3
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b^2 - 4b = 6b^2 =11 b
15b = -5b^2
5b^2 = -15b
b^2 = -3b
0; -3