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D( x )
x-6 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x in (-oo:6) U (6:+oo)
(e^(9*x))/(x-6) = 0
(e^(9*x))/(x-6) = 0 // * x-6
e^(9*x) = 0
x należy do O
x belongs to the empty set
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