| 2000 | = | ( | P | − | 6 | ) | × | 1000 | − | 5000 |
| Right side of the equation = | P | × | 1000 | − | 6 | × | 1000 | − | 5000 |
| = | P | × | 1000 | − | 6000 | − | 5000 |
| = | 1000 | P | − | 11000 |
| 2000 | = | 1000 | P | − | 11000 |
| - | 1000 | P | = | - | 11000 | − | 2000 |
| - | 1000 | P | = | - | 13000 |
| 13000 | = | 1000 | P |
| 1000 | P | = | 13000 |
| P | = | 13000 | ÷ | 1000 |
| = | 13000 | × | 1 1000 |
| = | 13 | × | 1 |
| P | = | 13 |