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D( x )
x = 0
3-(3*x^-1) = 0
x = 0
x = 0
3-(3*x^-1) = 0
3-(3*x^-1) = 0
3-3*x^-1 = 0
-3*x^-1 = -3 // : -3
x^-1 = 1
-1 < 0
1/(x^1) = 1 // * x^1
1 = 1*x^1 // : 1
1 = x^1
x = 1
x in (-oo:0) U (0:1) U (1:+oo)
3/(3-(3*x^-1)) = 0
3/(3-3*x^-1) = 0
3 = 0
x belongs to the empty set
x belongs to the empty set
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