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y- cyfra jedności
1/4(10x+y)=x+y
10x - 4x = 4y - y
100x - 85x = 8,5y - y
6x = 3y
15x = 7,5y | /7,5
2x = y
2x = y
Szukane liczby to 12, 24, 36, 48