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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
17/x = 49/441 // - 49/441
17/x-(49/441) = 0
17/x-1/9 = 0
17*x^-1 = 1/9 // : 17
x^-1 = 1/153
-1 < 0
1/(x^1) = 1/153 // * x^1
1 = 1/153*x^1 // : 1/153
153 = x^1
x = 153
x = 153
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