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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-3*x-2 = 2/5 // - 2/5
2/x-3*x-(2/5)-2 = 0
2/x-3*x-2/5-2 = 0
2*x^-1-3*x^1-12/5*x^0 = 0
(2*x^0-3*x^2-12/5*x^1)/(x^1) = 0 // * x^2
x^1*(2*x^0-3*x^2-12/5*x^1) = 0
x^1
(-12/5)*x-3*x^2+2 = 0
(-12/5)*x-3*x^2+2 = 0
DELTA = (-12/5)^2-(-3*2*4)
DELTA = 744/25
DELTA > 0
x = ((744/25)^(1/2)-(-12/5))/(-3*2) or x = (-(-12/5)-(744/25)^(1/2))/(-3*2)
x = ((744/25)^(1/2)+12/5)/(-6) or x = (12/5-(744/25)^(1/2))/(-6)
x in { ((744/25)^(1/2)+12/5)/(-6), (12/5-(744/25)^(1/2))/(-6)}
x in { ((744/25)^(1/2)+12/5)/(-6), (12/5-(744/25)^(1/2))/(-6) }
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