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