x- ptaki
y- ssaki
x+y=170/* (-2)
2x+4y=560
-2x-2y=-340
2y=220
y=110
x=170-110=60
ptaki-60
ssaki-110
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x- ptaki
y- ssaki
x+y=170/* (-2)
2x+4y=560
-2x-2y=-340
2x+4y=560
2y=220
y=110
x=170-110=60
ptaki-60
ssaki-110