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y in (-oo:+oo)
(9/11)*y^2-((4/3)*y) = 0
(9/11)*y^2+(-4/3)*y = 0
9/11*y^2-4/3*y = 0
DELTA = (-4/3)^2-(0*9/11*4)
DELTA = 16/9
DELTA > 0
y = ((16/9)^(1/2)+4/3)/(9/11*2) or y = (4/3-(16/9)^(1/2))/(9/11*2)
y = 44/27 or y = 0
y in { 0, 44/27 }
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