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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
2/y+5/3 = 26/3-y // - 26/3-y
y+2/y+5/3-(26/3) = 0
y+2/y+5/3-26/3 = 0
1*y^1+2*y^-1-7*y^0 = 0
(1*y^2-7*y^1+2*y^0)/(y^1) = 0 // * y^2
y^1*(1*y^2-7*y^1+2*y^0) = 0
y^1
y^2-7*y+2 = 0
y^2-7*y+2 = 0
DELTA = (-7)^2-(1*2*4)
DELTA = 41
DELTA > 0
y = (41^(1/2)+7)/(1*2) or y = (7-41^(1/2))/(1*2)
y = (41^(1/2)+7)/2 or y = (7-41^(1/2))/2
y in { (7-41^(1/2))/2, (41^(1/2)+7)/2}
y in { (7-41^(1/2))/2, (41^(1/2)+7)/2 }
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