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gdzie x to waga kukułki
x+x+5 = 5,5 |-5
2x=0,5
x=0,25
5,5 - 0,25 = 5,25
5,25 - waga zegara
z=5+k
z+k=5,5
5+k+k=5,5
2k=0,5
k=0,25 kg
z=5,25 kg