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y - liczba jedności
x + y = 17
10x + y - 9 = 10y + x
x = 17 - y
9x -9y = 9
x=17 - y
9*(17 - y) -9y = 9
153 - 9y -9y = 9
-18y = -144 |:(-18)
y = 8
x = 17 - 8
x = 9
Odp. Szukana liczba to 98