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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 6/X-(1/3) // - 6/X-(1/3)
5/x-(6/X)+1/3 = 0
5/x-6*X^-1+1/3 = 0
5*x^-1 = -(1/3-6*X^-1) // : 5
x^-1 = (-(1/3-6*X^-1))/5
-1 < 0
1/(x^1) = (-(1/3-6*X^-1))/5 // * x^1
1 = x^1*((-(1/3-6*X^-1))/5) // : (-(1/3-6*X^-1))/5
-5*(1/3-6*X^-1)^-1 = x^1
x = -5*(1/3-6*X^-1)^-1
x = -5*(1/3-6*X^-1)^-1
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