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y - woda w 2 beczce
z danych:
x+y=1200
x-124=y+20
x=1200-y
podstawiamy
1200-y-124=y+20
1200-124-20=2y
2y=1056
y=528
x=1200-528=672
Odp. W beczce pierwszej znajdowalo sie 672, a w drugiej 528 litrow