x+y=8
10y+x=10x+y-54
x+y=8 |*9
-9x+9y=-54
9x+9y=72
-------------
18y=18
y=1
x+1=8
x=7
10*7+1=71 <-- to ta liczba
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x+y=8
10y+x=10x+y-54
x+y=8 |*9
-9x+9y=-54
9x+9y=72
-9x+9y=-54
-------------
18y=18
y=1
x+1=8
x=7
10*7+1=71 <-- to ta liczba