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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/x = 0.7 // - 0.7
9/x-0.7 = 0
9*x^-1 = 0.7 // : 9
x^-1 = 0.07777778
-1 < 0
1/(x^1) = 0.07777778 // * x^1
1 = 0.07777778*x^1 // : 0.07777778
12.85714249 = x^1
x = 12.85714249
x = 12.85714249
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