| X | − | ( | 5 | + | ( | X | − | 100 | ) | × | 1 10 | ) | = | 6859 25 |
| 方程左边 = | X | − | 5 | − | ( | X | − | 100 | ) | × | 1 10 |
| = | X | − | 5 | − | X | × | 1 10 | + | 100 | × | 1 10 |
| = | X | − | 5 | − | X | × | 1 10 | + | 10 |
| = | 9 10 | X | + | 5 |
9 10 | X | + | 5 | = | 6859 25 |
9 10 | X | = | 6859 25 | − | 5 |
9 10 | X | = | 6734 25 |
| X | = | 6734 25 | ÷ | 9 10 |
| = | 6734 25 | × | 10 9 |
| = | 6734 5 | × | 2 9 |
| X | = | 13468 45 |
| X | = | 299.288889 |