| 12 | ÷ | 103 | + | 30 | ÷ | 200 | + | X | ÷ | 1000 | + | ( | 111 2 | − | X | ) | × | 1650 | = | 3 10 |
| 方程左边 = | 12 103 | + | 3 20 | + | X | × | 1 1000 | + | ( | 111 2 | − | X | ) | × | 1650 |
| = | 549 2060 | + | 1 1000 | X | + | ( | 111 2 | − | X | ) | × | 1650 |
549 2060 | + | 1 1000 | X | + | ( | 111 2 | − | X | ) | × | 1650 | = | 3 10 |
| 方程左边 = | 549 2060 | + | 1 1000 | X | + | 111 2 | × | 1650 | − | X | × | 1650 |
| = | 549 2060 | + | 1 1000 | X | + | 91575 | − | X | × | 1650 |
| = | 188645049 2060 | − | 1649999 1000 | X |
188645049 2060 | − | 1649999 1000 | X | = | 3 10 |
| - | 1649999 1000 | X | = | 3 10 | − | 188645049 2060 |
| - | 1649999 1000 | X | = | - | 188644431 2060 |
188644431 2060 | = | 1649999 1000 | X |
1649999 1000 | X | = | 188644431 2060 |
| X | = | 188644431 2060 | ÷ | 1649999 1000 |
| = | 188644431 2060 | × | 1000 1649999 |
| = | 188644431 103 | × | 50 1649999 |
| X | = | 9432221550 169949897 |
| X | = | 55.500013 |