| 12600000 | + | 6000 | ( | x | − | 1000 | ) | = | 6300 | x |
| Left side of the equation = | 12600000 | + | 6000 | x | − | 6000 | × | 1000 |
| = | 12600000 | + | 6000 | x | − | 6000000 |
| = | 6600000 | + | 6000 | x |
| 6600000 | + | 6000 | x | = | 6300 | x |
| 6000 | x | − | 6300 | x | = | - | 6600000 |
| - | 300 | x | = | - | 6600000 |
| 6600000 | = | 300 | x |
| 300 | x | = | 6600000 |
| x | = | 6600000 | ÷ | 300 |
| = | 6600000 | × | 1 300 |
| = | 22000 | × | 1 |
| x | = | 22000 |