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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
30 = 115/x // - 115/x
30-(115/x) = 0
30-115*x^-1 = 0
-115*x^-1 = -30 // : -115
x^-1 = 6/23
-1 < 0
1/(x^1) = 6/23 // * x^1
1 = 6/23*x^1 // : 6/23
23/6 = x^1
x = 23/6
x = 23/6
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