设原来的两位数个位是 x ,则十位是 8 - x
所以
2[10(8 - x) + x] + 10 = 10x + 8 - x
2(80 - 9x) + 10 = 9x + 8
170 - 18x = 9x + 8
27x = 162
x = 6
十位 = 8 - x = 2
所以原来的两位数是 26