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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4/5)*x = 3/x+2 // - 3/x+2
(4/5)*x-(3/x)-2 = 0
(4/5)*x-3*x^-1-2 = 0
4/5*x^1-3*x^-1-2*x^0 = 0
(4/5*x^2-2*x^1-3*x^0)/(x^1) = 0 // * x^2
x^1*(4/5*x^2-2*x^1-3*x^0) = 0
x^1
(4/5)*x^2-2*x-3 = 0
(4/5)*x^2-2*x-3 = 0
DELTA = (-2)^2-(-3*4*(4/5))
DELTA = 68/5
DELTA > 0
x = ((68/5)^(1/2)+2)/(2*(4/5)) or x = (2-(68/5)^(1/2))/(2*(4/5))
x = 5/8*((68/5)^(1/2)+2) or x = 5/8*(2-(68/5)^(1/2))
x in { 5/8*(2-(68/5)^(1/2)), 5/8*((68/5)^(1/2)+2)}
x in { 5/8*(2-(68/5)^(1/2)), 5/8*((68/5)^(1/2)+2) }
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