| X | − | 10 | ÷ | 10 | − | 1 10 | = | 11 10 | X | − | 12 | ÷ | 12 |
| Left side of the equation = | X | − | 1 | − | 1 10 |
| = | X | − | 11 10 |
| X | − | 11 10 | = | 11 10 | X | − | 12 | ÷ | 12 |
| Right side of the equation = | 11 10 | X | − | 1 |
| X | − | 11 10 | = | 11 10 | X | − | 1 |
| X | − | 11 10 | X | = | - | 1 | + | 11 10 |
| - | 1 10 | X | = | - | 1 | + | 11 10 |
| - | 1 10 | X | = | 1 10 |
| - | 1 10 | = | 1 10 | X |
1 10 | X | = | - | 1 10 |
| X | = | - | 1 10 | ÷ | 1 10 |
| = | - | 1 10 | × | 10 |
| = | - | 1 | × | 1 |
| X | = | - | 1 |