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D( x )
((21*s^4*t^-4*z^6)/3)*t*z^4 = 0
((21*s^4*t^-4*z^6)/3)*t*z^4 = 0
((21*s^4*t^-4*z^6)/3)*t*z^4 = 0
7*s^4*t^-3*z^10 = 0
x należy do R
x belongs to the empty set
(((21*s^4*t^-4*z^6)/3)*t*z^4)^-3 = 0
x belongs to the empty set
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