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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(2/x) = 3/5 // - 3/5
x-(2/x)-(3/5) = 0
x-2*x^-1-3/5 = 0
1*x^1-2*x^-1-3/5*x^0 = 0
(1*x^2-3/5*x^1-2*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-3/5*x^1-2*x^0) = 0
x^1
x^2+(-3/5)*x-2 = 0
x^2+(-3/5)*x-2 = 0
DELTA = (-3/5)^2-(-2*1*4)
DELTA = 209/25
DELTA > 0
x = ((209/25)^(1/2)-(-3/5))/(1*2) or x = (-(-3/5)-(209/25)^(1/2))/(1*2)
x = ((209/25)^(1/2)+3/5)/2 or x = (3/5-(209/25)^(1/2))/2
x in { (3/5-(209/25)^(1/2))/2, ((209/25)^(1/2)+3/5)/2}
x in { (3/5-(209/25)^(1/2))/2, ((209/25)^(1/2)+3/5)/2 }
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