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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X-(4/x)+6 = 2*x+(3/2)*x-1 // - 2*x+(3/2)*x-1
X-(2*x)-((3/2)*x)-(4/x)+1+6 = 0
X-2*x+(-3/2)*x-4*x^-1+1+6 = 0
7*x^0-7/2*x^1-4*x^-1 = 0
(7*x^1-7/2*x^2-4*x^0)/(x^1) = 0 // * x^2
x^1*(7*x^1-7/2*x^2-4*x^0) = 0
x^1
(-7/2)*x^2+7*x-4 = 0
(-7/2)*x^2+7*x-4 = 0
DELTA = 7^2-(-4*4*(-7/2))
DELTA = -7
DELTA < 0
x in { }
x belongs to the empty set
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