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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*9-(10/2) = 34/x // - 34/x
3*9-(34/x)-(10/2) = 0
3*9-34*x^-1-5 = 0
-34*x^-1 = -22 // : -34
x^-1 = 11/17
-1 < 0
1/(x^1) = 11/17 // * x^1
1 = 11/17*x^1 // : 11/17
17/11 = x^1
x = 17/11
x = 17/11
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