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