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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/y = y-(2/3) // - y-(2/3)
5/y-y+2/3 = 0
5*y^-1-1*y^1+2/3*y^0 = 0
(2/3*y^1-1*y^2+5*y^0)/(y^1) = 0 // * y^2
y^1*(2/3*y^1-1*y^2+5*y^0) = 0
y^1
(2/3)*y-y^2+5 = 0
(2/3)*y-y^2+5 = 0
DELTA = (2/3)^2-(-1*4*5)
DELTA = 184/9
DELTA > 0
y = ((184/9)^(1/2)-(2/3))/(-1*2) or y = (-(2/3)-(184/9)^(1/2))/(-1*2)
y = ((184/9)^(1/2)-2/3)/(-2) or y = ((184/9)^(1/2)+2/3)/2
y in { ((184/9)^(1/2)-2/3)/(-2), ((184/9)^(1/2)+2/3)/2}
y in { ((184/9)^(1/2)-2/3)/(-2), ((184/9)^(1/2)+2/3)/2 }
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