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y - krolik
z - pies
x+y = 10
z+y = 20
z+x = 24
y=10-x
z+10-x=20
z+x=24
y=10-x
z=10+x
10+x+x=24
2x=14
x=7 - waga kota
7+y=10
y=3 - waga królika
z+3=20
z=17 waga psa