| 12 | ÷ | 103 | + | 25 | ÷ | 200 | + | X | ÷ | 1000 | + | ( | 121 2 | − | X | ) | × | 1650 | = | 3 10 |
| 方程左边 = | 12 103 | + | 1 8 | + | X | × | 1 1000 | + | ( | 121 2 | − | X | ) | × | 1650 |
| = | 199 824 | + | 1 1000 | X | + | ( | 121 2 | − | X | ) | × | 1650 |
199 824 | + | 1 1000 | X | + | ( | 121 2 | − | X | ) | × | 1650 | = | 3 10 |
| 方程左边 = | 199 824 | + | 1 1000 | X | + | 121 2 | × | 1650 | − | X | × | 1650 |
| = | 199 824 | + | 1 1000 | X | + | 99825 | − | X | × | 1650 |
| = | 82255999 824 | − | 1649999 1000 | X |
82255999 824 | − | 1649999 1000 | X | = | 3 10 |
| - | 1649999 1000 | X | = | 3 10 | − | 82255999 824 |
| - | 1649999 1000 | X | = | - | 411278759 4120 |
411278759 4120 | = | 1649999 1000 | X |
1649999 1000 | X | = | 411278759 4120 |
| X | = | 411278759 4120 | ÷ | 1649999 1000 |
| = | 411278759 4120 | × | 1000 1649999 |
| = | 411278759 103 | × | 25 1649999 |
| X | = | 10281968975 169949897 |