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D( x )
-4*a^5*r^3 = 0
-4*a^5*r^3 = 0
-4*a^5*r^3 = 0
-4*a^5*r^3 = 0
x należy do R
x belongs to the empty set
-3*a^4*(((-3*a^5)^4)/(-4*a^5*r^3)) = 0
x belongs to the empty set
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