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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(2*x)-((5/2)*x)+4/x-3 = 0
x-2*x+(-5/2)*x+4/x-3 = 0
4*x^-1-7/2*x^1-3*x^0 = 0
(4*x^0-7/2*x^2-3*x^1)/(x^1) = 0 // * x^2
x^1*(4*x^0-7/2*x^2-3*x^1) = 0
x^1
(-7/2)*x^2-3*x+4 = 0
(-7/2)*x^2-3*x+4 = 0
DELTA = (-3)^2-(4*4*(-7/2))
DELTA = 65
DELTA > 0
x = (65^(1/2)+3)/(2*(-7/2)) or x = (3-65^(1/2))/(2*(-7/2))
x = (65^(1/2)+3)/(-7) or x = (3-65^(1/2))/(-7)
x in { (65^(1/2)+3)/(-7), (3-65^(1/2))/(-7)}
x in { (65^(1/2)+3)/(-7), (3-65^(1/2))/(-7) }
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