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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
17/x = 1 // - 1
17/x-1 = 0
17*x^-1 = 1 // : 17
x^-1 = 1/17
-1 < 0
1/(x^1) = 1/17 // * x^1
1 = 1/17*x^1 // : 1/17
17 = x^1
x = 17
x = 17
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