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y - liczba jedności szukanej liczby
x+y=12
10x+y+54=10y+x
x=12-y
10(12-y)+y+54=10y+12-y
x=12-y
120-10y+y+54=9y+12
x=12-y
-9y+174=9y+12 |+9y |-12
x=12-y
18y=162 |:18
x=12-y
y=9
x=12-9
y=9
x=3
y=9
Odp. szukana liczba to 39