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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5*x-(2/x)-3 = 0
5*x-2*x^-1-3 = 0
5*x^1-2*x^-1-3*x^0 = 0
(5*x^2-3*x^1-2*x^0)/(x^1) = 0 // * x^2
x^1*(5*x^2-3*x^1-2*x^0) = 0
x^1
5*x^2-3*x-2 = 0
5*x^2-3*x-2 = 0
DELTA = (-3)^2-(-2*4*5)
DELTA = 49
DELTA > 0
x = (49^(1/2)+3)/(2*5) or x = (3-49^(1/2))/(2*5)
x = 1 or x = -2/5
x in { -2/5, 1}
x in { -2/5, 1 }
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