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y= cyfra jedność
10x+y= pierwsza liczba
10y+x= druga liczba
x+y=14
10x+y=10y+x+18
x=14-y
10x+y-10y-x=18
9x-9y=18/:9
x-y=2
14-y-y=2
-2y=2-14
-2y=-12
y=6
x=14-y=14-6=8
ta liczba to 86