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D( x )
10*x = 0
10*x = 0
10*x = 0
10*x = 0 // : 10
x = 0
x in (-oo:0) U (0:+oo)
((10*x)^-5)/4 = 0
1/400000*x^-5 = 0 // : 1/400000
x^-5 = 0
x należy do O
x belongs to the empty set
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