| X | − | 1 10 | X | − | 1 20 | X | − | 3 | = | 1507 5 | + | 3 20 | × | 1507 5 |
| 方程左边 = | 17 20 | X | − | 3 |
17 20 | X | − | 3 | = | 1507 5 | + | 3 20 | × | 1507 5 |
| 方程右边 = | 1507 5 | + | 4521 100 |
| = | 34661 100 |
17 20 | X | − | 3 | = | 34661 100 |
17 20 | X | = | 34661 100 | + | 3 |
17 20 | X | = | 34961 100 |
| X | = | 34961 100 | ÷ | 17 20 |
| = | 34961 100 | × | 20 17 |
| = | 34961 5 | × | 1 17 |
| X | = | 34961 85 |
| X | = | 411.305882 |