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y- liczba dziesiątek
x+y=12
(1*x)+(10*y)+54= (10*x)+(1*y)
y=12-x
(1*x)+(10*y)+54= (10*x)+(1*y)
y=12-x
x+10*(12-x)+54=(10*x)+(12-x)
y=12-x
x+120- 10x +54 = 10x +12-x
y=12-x
174-9x=9x+12
y=12-x
18x=162
y=12-x
x=9
y=3
x=9
Liczba szukana to 39.