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D( y )
y^2 = 0
y^2 = 0
y^2 = 0
1*y^2 = 0 // : 1
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
y-(3*y)+(5*y)/(y^2)-(7/3) = 0
y-3*y+(5*y)/(y^2)-7/3 = 0
5*y^-1-2*y^1-7/3*y^0 = 0
(5*y^0-2*y^2-7/3*y^1)/(y^1) = 0 // * y^2
y^1*(5*y^0-2*y^2-7/3*y^1) = 0
y^1
(-7/3)*y-2*y^2+5 = 0
(-7/3)*y-2*y^2+5 = 0
DELTA = (-7/3)^2-(-2*4*5)
DELTA = 409/9
DELTA > 0
y = ((409/9)^(1/2)-(-7/3))/(-2*2) or y = (-(-7/3)-(409/9)^(1/2))/(-2*2)
y = ((409/9)^(1/2)+7/3)/(-4) or y = (7/3-(409/9)^(1/2))/(-4)
y in { ((409/9)^(1/2)+7/3)/(-4), (7/3-(409/9)^(1/2))/(-4)}
y in { ((409/9)^(1/2)+7/3)/(-4), (7/3-(409/9)^(1/2))/(-4) }
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