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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/x = (2/7)/18 // - (2/7)/18
15/x-((2/7)/18) = 0
15/x-1/63 = 0
15*x^-1 = 1/63 // : 15
x^-1 = 1/945
-1 < 0
1/(x^1) = 1/945 // * x^1
1 = 1/945*x^1 // : 1/945
945 = x^1
x = 945
x = 945
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