| 8456 | + | 39 2 | − | 13 2 | + | 50 | = | X | − | ( | 7 2 | ÷ | 400 | × | X | ) |
| 方程左边 = | 8519 |
| 8519 | = | X | − | ( | 7 2 | ÷ | 400 | × | X | ) |
| 方程右边 = | X | − | 7 2 | ÷ | 400 | × | X |
| = | X | − | 7 800 | X |
| = | 793 800 | X |
| 8519 | = | 793 800 | X |
| - | 793 800 | X | = | - | 8519 |
| 8519 | = | 793 800 | X |
793 800 | X | = | 8519 |
| X | = | 8519 | ÷ | 793 800 |
| = | 8519 | × | 800 793 |
| X | = | 6815200 793 |
| X | = | 8594.199243 |