| X | ÷ | 2 | × | 2858 5 | + | ( | 5 | − | X | ) | × | 890 | = | 19229 5 |
| 方程左边 = | X | × | 1429 5 | + | ( | 5 | − | X | ) | × | 890 |
1429 5 | X | + | ( | 5 | − | X | ) | × | 890 | = | 19229 5 |
| 方程左边 = | 1429 5 | X | + | 5 | × | 890 | − | X | × | 890 |
| = | 1429 5 | X | + | 4450 | − | X | × | 890 |
| = | - | 3021 5 | X | + | 4450 |
| - | 3021 5 | X | + | 4450 | = | 19229 5 |
| - | 3021 5 | X | = | 19229 5 | − | 4450 |
| - | 3021 5 | X | = | - | 3021 5 |
3021 5 | = | 3021 5 | X |
3021 5 | X | = | 3021 5 |
| X | = | 3021 5 | ÷ | 3021 5 |
| = | 3021 5 | × | 5 3021 |
| = | 1 | × | 1 |
| X | = | 1 |