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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
y/5+3/y = 8/5 // - 8/5
y/5+3/y-(8/5) = 0
y/5+3/y-8/5 = 0
1/5*y^1+3*y^-1-8/5*y^0 = 0
(1/5*y^2-8/5*y^1+3*y^0)/(y^1) = 0 // * y^2
y^1*(1/5*y^2-8/5*y^1+3*y^0) = 0
y^1
(1/5)*y^2+(-8/5)*y+3 = 0
(1/5)*y^2+(-8/5)*y+3 = 0
DELTA = (-8/5)^2-(3*4*(1/5))
DELTA = 4/25
DELTA > 0
y = ((4/25)^(1/2)-(-8/5))/(2*(1/5)) or y = (-(-8/5)-(4/25)^(1/2))/(2*(1/5))
y = 5 or y = 3
y in { 3, 5}
y in { 3, 5 }
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