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