10 100 | − | X | ÷ | 10 100 | − | 15 100 | = | 8300 | − | 0 | ÷ | 8300 | − | ( | - | 3900 | ) |
| Left side of the equation = | - | 1 20 | − | 100 10 | X |
| - | 1 20 | − | 100 10 | X | = | 8300 | − | 0 | ÷ | 8300 | − | ( | - | 3900 | ) |
| Right side of the equation = | 8300 | − | 0 | − | ( | - | 3900 | ) |
| = | 8300 | − | ( | - | 3900 | ) |
| - | 1 20 | − | 100 10 | X | = | 8300 | − | ( | - | 3900 | ) |
| Right side of the equation = | 8300 | + | 3900 |
| = | 12200 |
| - | 1 20 | − | 100 10 | X | = | 12200 |
| - | 100 10 | X | = | 12200 | + | 1 20 |
| - | 100 10 | X | = | 244001 20 |
| - | 244001 20 | = | 100 10 | X |
100 10 | X | = | - | 244001 20 |
| X | = | - | 244001 20 | ÷ | 100 10 |
| = | - | 244001 20 | × | 10 100 |
| = | - | 244001 2 | × | 1 100 |
| X | = | - | 244001 200 |
| X | = | - 1220.005 |