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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((-125*x^-12)^1)/3 = 0
(-125*x^-12)/3 = 0
-125/3*x^-12 = 0 // : -125/3
x^-12 = 0
x należy do O
x belongs to the empty set
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