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D( x )
(12*m^5*n^7)^2 = 0
(12*m^5*n^7)^2 = 0
(12*m^5*n^7)^2 = 0
144*m^10*n^14 = 0
x należy do R
x belongs to the empty set
((6*m^3*n^5)^4)/((12*m^5*n^7)^2) = 0
x belongs to the empty set
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