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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x = 119 // - 119
7/x-119 = 0
7*x^-1 = 119 // : 7
x^-1 = 17
-1 < 0
1/(x^1) = 17 // * x^1
1 = 17*x^1 // : 17
1/17 = x^1
x = 1/17
x = 1/17
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