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