`a, (overline{80x}-801).12=0`
`overline{80x}-801 = 0:12`
`overline{80x}-801 =0`
`overline{80x} =0+801`
`overline{80x} =801`
`⇒ x = 1`
`b, (overline{x1} - 10).32=32`
`overline{x1} - 10 = 32:32`
`overline{x1} - 10 = 1`
`overline{x1} =1+10`
`overline{x1} =11`
`⇒ x = 1`