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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
22/x = 2/15 // - 2/15
22/x-(2/15) = 0
22/x-2/15 = 0
22*x^-1 = 2/15 // : 22
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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