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x 2 y
x + 2 + y = 12
x + y = 10 => x = 10 - y
100x + 20 + y = 200 + 10x + y + 450
100x + 20 = 200 + 10x + 450
90x = 630 / 90
x = 7
y = 12 - 7 - 2
y = 3
Ta liczba to 723