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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
34/9 = 138/x // - 138/x
34/9-(138/x) = 0
34/9-138*x^-1 = 0
-138*x^-1 = -34/9 // : -138
x^-1 = 17/621
-1 < 0
1/(x^1) = 17/621 // * x^1
1 = 17/621*x^1 // : 17/621
621/17 = x^1
x = 621/17
x = 621/17
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