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x+x=5,5+5
2x=10,5|:2
x=5,25kg
Odp.:Zegar waży 5,25kg,a kukulka 0,25kg.
x waga zegara
y waga kukulki
y=x-5
y+x=5,5
x-5+x=5,5
2x=10,5
x=5,25
y=0,25