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2x + 4y = 6
x = 4y
2x + 4y = 6
x - 4y = 0
3x = 6 / : 3
x = 2 l
4y = 2 / : 4
y = 0,5 l
Odp. W dużej butelce mieści się 2 l, a w małej 0,5 l