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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)
(-x-6*2)/(x^-4) = 0
(-x-12)/(x^-4) = 0
-x-12 = 0 // + 12
-x = 12 // * -1
x = -12
x = -12
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