| 64 | + | 4 | + | 11 | + | 1 | + | X | × | 3 20 | + | 619 10 | + | 60 | + | 10 | + | 10 | = | X |
| 方程左边 = | 2219 10 | + | 3 20 | X |
2219 10 | + | 3 20 | X | = | X |
3 20 | X | − | X | = | - | 2219 10 |
| - | 17 20 | X | = | - | 2219 10 |
2219 10 | = | 17 20 | X |
17 20 | X | = | 2219 10 |
| X | = | 2219 10 | ÷ | 17 20 |
| = | 2219 10 | × | 20 17 |
| = | 2219 | × | 2 17 |
| X | = | 4438 17 |
| X | = | 261.058824 |