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D( x )
((s^3)/9)*t^4 = 0
((s^3)/9)*t^4 = 0
((s^3)/9)*t^4 = 0
1/9*s^3*t^4 = 0
x należy do R
x belongs to the empty set
(((s^5)/3)*t^2)/(((s^3)/9)*t^4) = 0
x belongs to the empty set
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