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D( x )
12*x = 0
12*x = 0
12*x = 0
12*x = 0 // : 12
x = 0
x in (-oo:0) U (0:+oo)
(12*x)^(-10/11)*(12*x)^(3/11) = 0
12^(-7/11)*x^(-7/11) = 0 // : 12^(-7/11)
x^(-7/11) = 0
x należy do O
x belongs to the empty set
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