| 55500 | × | 12 | − | 7 10 | × | 3 10 | X | = | 19 50 | × | 15 | × | 33 100 | X |
| 方程左边 = | 666000 | − | 21 100 | X |
| 666000 | − | 21 100 | X | = | 19 50 | × | 15 | × | 33 100 | X |
| 方程右边 = | 1881 1000 | X |
| 666000 | − | 21 100 | X | = | 1881 1000 | X |
| - | 21 100 | X | − | 1881 1000 | X | = | - | 666000 |
| - | 2091 1000 | X | = | - | 666000 |
| 666000 | = | 2091 1000 | X |
2091 1000 | X | = | 666000 |
| X | = | 666000 | ÷ | 2091 1000 |
| = | 666000 | × | 1000 2091 |
| = | 222000 | × | 1000 697 |
| X | = | 222000000 697 |
| X | = | 318507.890961 |