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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18/x = 30/31 // - 30/31
18/x-(30/31) = 0
18/x-30/31 = 0
18*x^-1 = 30/31 // : 18
x^-1 = 5/93
-1 < 0
1/(x^1) = 5/93 // * x^1
1 = 5/93*x^1 // : 5/93
93/5 = x^1
x = 93/5
x = 93/5
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