| ( | 76839 | − | 5 2 | X | ) | × | 9 | ÷ | 20 | × | 9 10 | = | 22247 | + | 15 2 | X |
| 方程左边 = | ( | 76839 | − | 5 2 | X | ) | × | 81 200 |
| ( | 76839 | − | 5 2 | X | ) | × | 81 200 | = | 22247 | + | 15 2 | X |
| 方程左边 = | 76839 | × | 81 200 | − | 5 2 | X | × | 81 200 |
| = | 6223959 200 | − | 81 80 | X |
6223959 200 | − | 81 80 | X | = | 22247 | + | 15 2 | X |
| - | 81 80 | X | − | 15 2 | X | = | 22247 | − | 6223959 200 |
| - | 681 80 | X | = | 22247 | − | 6223959 200 |
| - | 681 80 | X | = | - | 1774559 200 |
1774559 200 | = | 681 80 | X |
681 80 | X | = | 1774559 200 |
| X | = | 1774559 200 | ÷ | 681 80 |
| = | 1774559 200 | × | 80 681 |
| = | 1774559 5 | × | 2 681 |
| X | = | 3549118 3405 |
| X | = | 1042.325404 |