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D( x )
6*(-1/6)*x = 0
6*(-1/6)*x = 0
6*(-1/6)*x = 0
-1*x = 0 // : -1
x = 0
x in (-oo:0) U (0:+oo)
1/(6*(-1/6)*x) = 0
-1*x^-1 = 0 // : -1
x^-1 = 0
x należy do O
x belongs to the empty set
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