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D( x )
(2*s^-1*t)^-5 = 0
2*s^-1*t = 0
(2*s^-1*t)^-5 = 0
(2*s^-1*t)^-5 = 0
1/32*s^5*t^-5 = 0
x należy do R
2*s^-1*t = 0
2*s^-1*t = 0
2*s^-1*t = 0
x należy do R
x belongs to the empty set
(8^-1*t^0*s^-3)/((2*s^-1*t)^-5) = 0
x belongs to the empty set
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