| 347 | + | 2 | × | 11 | + | 3 | × | 17 | + | 4 | × | 16 | + | 5 | × | 84 | + | 5 | X | = | 9 2 | ( | X | + | 475 | ) |
| 方程左边 = | 347 | + | 22 | + | 51 | + | 64 | + | 420 | + | 5 | X |
| = | 904 | + | 5 | X |
| 904 | + | 5 | X | = | 9 2 | ( | X | + | 475 | ) |
| 方程右边 = | 9 2 | X | + | 9 2 | × | 475 |
| = | 9 2 | X | + | 4275 2 |
| 904 | + | 5 | X | = | 9 2 | X | + | 4275 2 |
| 5 | X | − | 9 2 | X | = | 4275 2 | − | 904 |
1 2 | X | = | 4275 2 | − | 904 |
1 2 | X | = | 2467 2 |
| X | = | 2467 2 | ÷ | 1 2 |
| = | 2467 2 | × | 2 |
| = | 2467 | × | 1 |
| X | = | 2467 |