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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-2 = (5/2)*x-1 // - (5/2)*x-1
2/x-((5/2)*x)-2+1 = 0
(-5/2)*x+2/x-2+1 = 0
2*x^-1-5/2*x^1-1*x^0 = 0
(2*x^0-5/2*x^2-1*x^1)/(x^1) = 0 // * x^2
x^1*(2*x^0-5/2*x^2-1*x^1) = 0
x^1
(-5/2)*x^2-x+2 = 0
(-5/2)*x^2-x+2 = 0
DELTA = (-1)^2-(2*4*(-5/2))
DELTA = 21
DELTA > 0
x = (21^(1/2)+1)/(2*(-5/2)) or x = (1-21^(1/2))/(2*(-5/2))
x = (21^(1/2)+1)/(-5) or x = (1-21^(1/2))/(-5)
x in { (21^(1/2)+1)/(-5), (1-21^(1/2))/(-5)}
x in { (21^(1/2)+1)/(-5), (1-21^(1/2))/(-5) }
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