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y - ilość królików
x+y=35
2x+4y=94
x=35-y
2(35-y)+4y=94
x=35-y
70-2y+4y=94
x=35-y
2y=24 /:2
x=35-y
y=12
x=35-12
y=12
x=23
y=12
Odp: Królików było 12, a bażantów 23.