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X in (-oo:+oo)
(1/6)*X^2 = 2*X-(15/2) // - 2*X-(15/2)
(1/6)*X^2-(2*X)+15/2 = 0
(1/6)*X^2-2*X+15/2 = 0
1/6*X^2-2*X+15/2 = 0
DELTA = (-2)^2-(1/6*4*15/2)
DELTA = -1
DELTA < 0
X belongs to the empty set
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