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kukułka- x-5
zegar-x
(x-5)+x=5,5kg
2x=10,5 /:2
x=5,25
5,25kg +0,25kg=5,5kg
2x = 5,5 + 5
2x = 6 /:2
x = 3
Sprawdzenie:
Zegar = 3kg
Kukułka = 2,5