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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((6/7)*x^-1)/7-(((13/7)*x^6)/7) = 0
(-13/49)*x^6+((6/7)*x^-1)/7 = 0
6/49*x^-1-13/49*x^6 = 0
1/49*x^-1*(6-13*x^7) = 0
-13*x^7 = -6 // : -13
x^7 = 6/13
x^7 = 6/13 // ^ 1/7
x = (6/13)^(1/7)
1/(49*x) = 0
1/49*x^-1 = 0 // : 1/49
x^-1 = 0
x należy do O
x = (6/13)^(1/7)
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