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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)
2.5 = ln(7/x) // - ln(7/x)
2.5-ln(7/x) = 0
2.5-ln(7/x) = 0 // - 2.5
-ln(7/x) = -2.5
-ln(7/x) = -2.5 // * -1
ln(7/x) = ln(e^2.5)
7/x = e^2.5
7/x-e^2.5 = 0
7*x^-1 = e^2.5 // : 7
x^-1 = (e^2.5)/7
-1 < 0
1/(x^1) = (e^2.5)/7 // * x^1
1 = ((e^2.5)/7)*x^1 // : (e^2.5)/7
7*e^-2.5 = x^1
x = 7*e^-2.5
x = 7*e^-2.5
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