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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
2/y-(y/3) = 5/3 // - 5/3
2/y-(y/3)-(5/3) = 0
2/y-(y/3)-5/3 = 0
2*y^-1-1/3*y^1-5/3*y^0 = 0
(2*y^0-1/3*y^2-5/3*y^1)/(y^1) = 0 // * y^2
y^1*(2*y^0-1/3*y^2-5/3*y^1) = 0
y^1
(-1/3)*y^2+(-5/3)*y+2 = 0
(-1/3)*y^2+(-5/3)*y+2 = 0
DELTA = (-5/3)^2-(2*4*(-1/3))
DELTA = 49/9
DELTA > 0
y = ((49/9)^(1/2)-(-5/3))/(2*(-1/3)) or y = (-(-5/3)-(49/9)^(1/2))/(2*(-1/3))
y = -6 or y = 1
y in { -6, 1}
y in { -6, 1 }
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