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D( x )
x = 0
7/x <= 0
x = 0
x = 0
7/x <= 0
7/x <= 0
7*x^-1 <= 0
7*x^-1 <= 0 // : 7
x^-1 <= 0/7
x^-1 <= 0
1/(x^1) <= 0
x <> 0
1/(x^1) <= 0 // * x^2
(x^2)/(x^1) <= 0
x^1 <= 0
x <= 0
x in (-oo:0)
x in (0:+oo)
9*ln(7/x) = 0
9*ln(7/x) = 0 // : 9
ln(7/x) = 0
ln(7/x) = ln(e^0)
7/x = e^0
7/x-e^0 = 0
7*x^-1 = 1 // : 7
x^-1 = 1/7
-1 < 0
1/(x^1) = 1/7 // * x^1
1 = 1/7*x^1 // : 1/7
7 = x^1
x = 7
x = 7
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