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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(5/x)-3 = 1 // - 1
x-(5/x)-3-1 = 0
x-5*x^-1-3-1 = 0
1*x^1-5*x^-1-4*x^0 = 0
(1*x^2-4*x^1-5*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-4*x^1-5*x^0) = 0
x^1
x^2-4*x-5 = 0
x^2-4*x-5 = 0
DELTA = (-4)^2-(-5*1*4)
DELTA = 36
DELTA > 0
x = (36^(1/2)+4)/(1*2) or x = (4-36^(1/2))/(1*2)
x = 5 or x = -1
x in { -1, 5}
x in { -1, 5 }
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