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D( x )
x = 0
7*x-2 = 0
x = 0
x = 0
7*x-2 = 0
7*x-2 = 0
7*x-2 = 0 // + 2
7*x = 2 // : 7
x = 2/7
x in (-oo:0) U (0:2/7) U (2/7:+oo)
(12*x^-7*x-11)/(7*x-2) = 0
(12*x^-6-11)/(7*x-2) = 0
12*x^-6 = 11 // : 12
x^-6 = 11/12
-6 < 0
1/(x^6) = 11/12 // * x^6
1 = 11/12*x^6 // : 11/12
12/11 = x^6
x^6 = 12/11 // ^ 1/6
abs(x) = (12/11)^(1/6)
x = (12/11)^(1/6) or x = -(12/11)^(1/6)
x in { (12/11)^(1/6), -(12/11)^(1/6) }
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