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y in (-oo:+oo)
(4/9)*y^2-((2/3)*y)+1/3 = 0
(4/9)*y^2+(-2/3)*y+1/3 = 0
4/9*y^2-2/3*y+1/3 = 0
DELTA = (-2/3)^2-(1/3*4/9*4)
DELTA = -4/27
DELTA < 0
y belongs to the empty set
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