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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x = 25 // - 25
6/x-25 = 0
6*x^-1 = 25 // : 6
x^-1 = 25/6
-1 < 0
1/(x^1) = 25/6 // * x^1
1 = 25/6*x^1 // : 25/6
6/25 = x^1
x = 6/25
x = 6/25
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