416 5 | = | ( | 7 | P | − | 11689 25 | ) | × | 3 4 |
| 方程右边 = | 7 | P | × | 3 4 | − | 11689 25 | × | 3 4 |
| = | 21 4 | P | − | 35067 100 |
416 5 | = | 21 4 | P | − | 35067 100 |
| - | 21 4 | P | = | - | 35067 100 | − | 416 5 |
| - | 21 4 | P | = | - | 43387 100 |
43387 100 | = | 21 4 | P |
21 4 | P | = | 43387 100 |
| P | = | 43387 100 | ÷ | 21 4 |
| = | 43387 100 | × | 4 21 |
| = | 43387 25 | × | 1 21 |
| P | = | 43387 525 |
| P | = | 82.641905 |