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y-cyfra jedności
x+y=14
10y+x+18=10x+y
x=14-y
-9y+9x=18
x=14-y
-9y+9(14-y)=18
x=14-y
-9y+126-9y=18
x=14-y
18y=108
x=14-y
y=6
x=8