10 100 | − | x | − | 15 100 | = | 8300 | − | 0 | − | ( | - | 3910 | ) |
| Left side of the equation = | - | 1 20 | − | x |
| - | 1 20 | − | x | = | 8300 | − | 0 | − | ( | - | 3910 | ) |
| Right side of the equation = | 8300 | − | ( | - | 3910 | ) |
| - | 1 20 | − | x | = | 8300 | − | ( | - | 3910 | ) |
| Right side of the equation = | 8300 | + | 3910 |
| = | 12210 |
| - | 1 20 | − | x | = | 12210 |
| - | x | = | 12210 | + | 1 20 |
| - | x | = | 244201 20 |
| - | 244201 20 | = | x |
| x | = | - | 244201 20 |