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D( x )
(((x^1)/6)*y^1)/3 = 0
(((x^1)/6)*y^1)/3 = 0
(((x^1)/6)*y^1)/3 = 0
((x/6)*y)/3 = 0
1/18*x*y = 0 // : 1/18*y
x = 0
x in (-oo:0) U (0:+oo)
((((x^1)/6)*y^1)/3)^-18 = 0
(((x/6)*y)/3)^-18 = 0
39346408075296537575424*x^-18*y^-18 = 0 // : 39346408075296537575424*y^-18
x^-18 = 0
x należy do O
x belongs to the empty set
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