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k - waga kota
r - waga Krzyśka
p=k+1kg
r=4*k = 4k
p+k+r = 19kg
(k+1kg)+k +4k=19kg
6k=18kg /:6
k=3kg.
Waga kota = 3kg
Waga psa = 3kg+1 = 4kg
Waga Krzyska = 4k = 4*3 = 12kg
x+1-pies 4kg
4x- Krzyś 12kg
x+x+1+4x=19
6x=19-1
6x=18 /:6
x=3