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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
13/17 = 4/x // - 4/x
13/17-(4/x) = 0
13/17-4*x^-1 = 0
-4*x^-1 = -13/17 // : -4
x^-1 = 13/68
-1 < 0
1/(x^1) = 13/68 // * x^1
1 = 13/68*x^1 // : 13/68
68/13 = x^1
x = 68/13
x = 68/13
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