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y-liczba jedności
x+y=13
10y+x=10x+y-27
x+y=13
9y-9x=-27|:9
x+y=13
y-x=-3 => y=x-3
x+(x-3)=13
2x-3=13
2x=16
x=8
y=x-3=> y=8-3=5
szukana liczba to : 85