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x-0,1kg-waga serca
1,4kg-waga mózgu
2*(x+x-0,1kg)=1,4kg
2x+2x-0,2kg=1,4kg
4x=1,4kg+0,2kg
4x=1,6kg/:4
x=0,4kg-waga gołębia
x-0,1kg=
0,4kg-0,1kg=
0,3kg-waga serca
odp.serce waży 0,3kg