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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/x = 1/15 // - 1/15
11/x-(1/15) = 0
11/x-1/15 = 0
11*x^-1 = 1/15 // : 11
x^-1 = 1/165
-1 < 0
1/(x^1) = 1/165 // * x^1
1 = 1/165*x^1 // : 1/165
165 = x^1
x = 165
x = 165
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