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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(2/x)-1 = 3/5 // - 3/5
x-(2/x)-(3/5)-1 = 0
x-2*x^-1-3/5-1 = 0
1*x^1-2*x^-1-8/5*x^0 = 0
(1*x^2-8/5*x^1-2*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-8/5*x^1-2*x^0) = 0
x^1
x^2+(-8/5)*x-2 = 0
x^2+(-8/5)*x-2 = 0
DELTA = (-8/5)^2-(-2*1*4)
DELTA = 264/25
DELTA > 0
x = ((264/25)^(1/2)-(-8/5))/(1*2) or x = (-(-8/5)-(264/25)^(1/2))/(1*2)
x = ((264/25)^(1/2)+8/5)/2 or x = (8/5-(264/25)^(1/2))/2
x in { (8/5-(264/25)^(1/2))/2, ((264/25)^(1/2)+8/5)/2}
x in { (8/5-(264/25)^(1/2))/2, ((264/25)^(1/2)+8/5)/2 }
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