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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(4/5)*y-(3/y) = 3/5 // - 3/5
(4/5)*y-(3/y)-(3/5) = 0
(4/5)*y-3*y^-1-3/5 = 0
4/5*y^1-3*y^-1-3/5*y^0 = 0
(4/5*y^2-3/5*y^1-3*y^0)/(y^1) = 0 // * y^2
y^1*(4/5*y^2-3/5*y^1-3*y^0) = 0
y^1
(4/5)*y^2+(-3/5)*y-3 = 0
(4/5)*y^2+(-3/5)*y-3 = 0
DELTA = (-3/5)^2-(-3*4*(4/5))
DELTA = 249/25
DELTA > 0
y = ((249/25)^(1/2)-(-3/5))/(2*(4/5)) or y = (-(-3/5)-(249/25)^(1/2))/(2*(4/5))
y = 5/8*((249/25)^(1/2)+3/5) or y = 5/8*(3/5-(249/25)^(1/2))
y in { 5/8*(3/5-(249/25)^(1/2)), 5/8*((249/25)^(1/2)+3/5)}
y in { 5/8*(3/5-(249/25)^(1/2)), 5/8*((249/25)^(1/2)+3/5) }
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