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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x^6 = 14/x // - 14/x
4*x^6-(14/x) = 0
4*x^6-14*x^-1 = 0
4*x^6-14*x^-1 = 0
2*x^-1*(2*x^7-7) = 0
2*x^7 = 7 // : 2
x^7 = 7/2
x^7 = 7/2 // ^ 1/7
x = (7/2)^(1/7)
2/x = 0
2*x^-1 = 0 // : 2
x^-1 = 0
x należy do O
x = (7/2)^(1/7)
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