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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
17/x = 12/4 // - 12/4
17/x-(12/4) = 0
17/x-3 = 0
17*x^-1 = 3 // : 17
x^-1 = 3/17
-1 < 0
1/(x^1) = 3/17 // * x^1
1 = 3/17*x^1 // : 3/17
17/3 = x^1
x = 17/3
x = 17/3
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