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D( b )
3*b^2-12 = 0
3*b^2-12 = 0
3*b^2-12 = 0
3*b^2 = 12 // : 3
b^2 = 4
b^2 = 4 // ^ 1/2
abs(b) = 2
b = 2 or b = -2
b in (-oo:-2) U (-2:2) U (2:+oo)
(6*b-3)/(3*b^2-12) = 0
6*b-3 = 0 // + 3
6*b = 3 // : 6
b = 3/6
b = 1/2
b = 1/2
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