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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*x-(5*x)-(18/x)-6 = 0
3*x-5*x-18*x^-1-6 = 0
-2*x^1-18*x^-1-6*x^0 = 0
(-2*x^2-6*x^1-18*x^0)/(x^1) = 0 // * x^2
x^1*(-2*x^2-6*x^1-18*x^0) = 0
x^1
-2*x^2-6*x-18 = 0
-2*x^2-6*x-18 = 0
DELTA = (-6)^2-(-18*(-2)*4)
DELTA = -108
DELTA < 0
x in { }
x belongs to the empty set
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