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D( x )
x = 0
2*x = 0
x = 0
x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (-oo:0) U (0:+oo)
x^-4*(((2*x)^-3*x^2)/4) = 0
1/32*x^-5 = 0 // : 1/32
x^-5 = 0
x należy do O
x belongs to the empty set
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