| X | − | 1 10 | X | − | 1 20 | X | − | 3 | = | 447 | + | 3 20 | × | 447 |
| 方程左边 = | 17 20 | X | − | 3 |
17 20 | X | − | 3 | = | 447 | + | 3 20 | × | 447 |
| 方程右边 = | 447 | + | 1341 20 |
| = | 10281 20 |
17 20 | X | − | 3 | = | 10281 20 |
17 20 | X | = | 10281 20 | + | 3 |
17 20 | X | = | 10341 20 |
| X | = | 10341 20 | ÷ | 17 20 |
| = | 10341 20 | × | 20 17 |
| = | 10341 | × | 1 17 |
| X | = | 10341 17 |
| X | = | 608.294118 |