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D( x )
a^3*((6*b)/19) = 0
a^3*((6*b)/19) = 0
a^3*((6*b)/19) = 0
6/19*a^3*b = 0
x należy do R
x belongs to the empty set
(a^3*((6*b)/19))^0 = 0
x belongs to the empty set
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