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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*6-x)/(x^-4) = 0
(12-x)/(x^-4) = 0
12-x = 0 // - 12
-x = -12 // * -1
x = 12
x = 12
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