| ( | X | − | 121023 1000 | ) | × | 10 | − | 3 5 | − | 3 5 | = | 2 |
| 方程左边 = | ( | X | − | 121023 1000 | ) | × | 10 | − | 6 5 |
| ( | X | − | 121023 1000 | ) | × | 10 | − | 6 5 | = | 2 |
| 方程左边 = | X | × | 10 | − | 121023 1000 | × | 10 | − | 6 5 |
| = | X | × | 10 | − | 121023 100 | − | 6 5 |
| = | 10 | X | − | 121143 100 |
| 10 | X | − | 121143 100 | = | 2 |
| 10 | X | = | 2 | + | 121143 100 |
| 10 | X | = | 121343 100 |
| X | = | 121343 100 | ÷ | 10 |
| = | 121343 100 | × | 1 10 |
| X | = | 121343 1000 |
| X | = | 121.343 |