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y - kot
z - Krzyś
x+y+z=19
x=y+1
z=4*y
y+1+y+4*y=19
6*y=19-1
6*y=18
y=3
x=3+1
x=4
z=4*3
z=12
Kot waży 3 kg, pies 4kg, a Krzyś 12kg.