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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/x-1 = 6 // - 6
15/x-6-1 = 0
15*x^-1 = 7 // : 15
x^-1 = 7/15
-1 < 0
1/(x^1) = 7/15 // * x^1
1 = 7/15*x^1 // : 7/15
15/7 = x^1
x = 15/7
x = 15/7
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