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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/15 = 117/x // - 117/x
9/15-(117/x) = 0
9/15-117*x^-1 = 0
-117*x^-1 = -3/5 // : -117
x^-1 = 1/195
-1 < 0
1/(x^1) = 1/195 // * x^1
1 = 1/195*x^1 // : 1/195
195 = x^1
x = 195
x = 195
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