ab6c + d8ef = 9977
ab0c = 8*d0ef
ab6c-60 = 8(d8ef-800)
ab6c-60 = 8*d8ef - 6400
ab6c = 8*d8ef - 6400 + 60 = 8*d8ef - 6340
Inlocuim in suma initiala
ab6c + d8ef = 9977
8*d8ef - 6340 + d8ef = 9977
9*d8ef - 6340 = 9977
9*d8ef = 9977+6340 = 16137
d8ef = 16137:9 = 1813
ab6c = 9977-1813 = 8164