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b in (-oo:+oo)
b-(4/6) = b^2 // - b^2
b-b^2-(4/6) = 0
b-b^2-2/3 = 0
b-b^2-2/3 = 0
DELTA = 1^2-(-1*(-2/3)*4)
DELTA = -5/3
DELTA < 0
b belongs to the empty set
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