| ( | ( | 220 | + | 220 | ) | × | 63 | − | X | ) | × | 17 20 | + | 8 | × | 63 | = | 433589 20 |
| 方程左边 = | ( | ( | 220 | + | 220 | ) | × | 63 | − | X | ) | × | 17 20 | + | 504 |
| ( | ( | 220 | + | 220 | ) | × | 63 | − | X | ) | × | 17 20 | + | 504 | = | 433589 20 |
| 方程左边 = | ( | 220 | + | 220 | ) | × | 63 | × | 17 20 | − | X | × | 17 20 | + | 504 |
| = | ( | 220 | + | 220 | ) | × | 1071 20 | − | X | × | 17 20 | + | 504 |
| = | 220 | × | 1071 20 | + | 220 | × | 1071 20 | − | 17 20 | X | + | 504 |
| = | 11781 | + | 11781 | − | 17 20 | X | + | 504 |
| = | 24066 | − | 17 20 | X |
| 24066 | − | 17 20 | X | = | 433589 20 |
| - | 17 20 | X | = | 433589 20 | − | 24066 |
| - | 17 20 | X | = | - | 47731 20 |
47731 20 | = | 17 20 | X |
17 20 | X | = | 47731 20 |
| X | = | 47731 20 | ÷ | 17 20 |
| = | 47731 20 | × | 20 17 |
| = | 47731 | × | 1 17 |
| X | = | 47731 17 |
| X | = | 2807.705882 |