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y in (-oo:+oo)
y^2-((6/3)*y^3)-(5*y^2)-y = 0
y^2-2*y^3-5*y^2-y = 0
-2*y^3-4*y^2-y = 0
-y*(2*y^2+4*y+1) = 0
2*y^2+4*y+1 = 0
DELTA = 4^2-(1*2*4)
DELTA = 8
DELTA > 0
y = (8^(1/2)-4)/(2*2) or y = (-8^(1/2)-4)/(2*2)
y = (2*2^(1/2)-4)/4 or y = (-2*2^(1/2)-4)/4
-y = 0
-1*y = 0 // : -1
y = 0
y in { (-2*2^(1/2)-4)/4, (2*2^(1/2)-4)/4, 0 }
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