| 10000 | p | × | 25 100 | = | 10000 | p | × | 5 100 | − | ( | 200 | × | 10000 | − | 850000 | ) |
| 方程左边 = | 2500 | p |
| 2500 | p | = | 10000 | p | × | 5 100 | − | ( | 200 | × | 10000 | − | 850000 | ) |
| 方程右边 = | 500 | p | − | ( | 200 | × | 10000 | − | 850000 | ) |
| 2500 | p | = | 500 | p | − | ( | 200 | × | 10000 | − | 850000 | ) |
| 方程右边 = | 500 | p | − | 200 | × | 10000 | + | 850000 |
| = | 500 | p | − | 2000000 | + | 850000 |
| = | 500 | p | − | 1150000 |
| 2500 | p | = | 500 | p | − | 1150000 |
| 2500 | p | − | 500 | p | = | - | 1150000 |
| 2000 | p | = | - | 1150000 |
| p | = | - | 1150000 | ÷ | 2000 |
| = | - | 1150000 | × | 1 2000 |
| = | - | 575 | × | 1 |
| p | = | - | 575 |