| X | − | X | × | 1 20 | − | X | ÷ | 109 100 | × | 1 500 | − | ( | X | + | 501373 2 | ) | × | 3 10000 | = | 501373 2 |
| 方程左边 = | X | − | X | × | 1 20 | − | X | × | 1 545 | − | ( | X | + | 501373 2 | ) | × | 3 10000 |
| = | 2067 2180 | X | − | ( | X | + | 501373 2 | ) | × | 3 10000 |
2067 2180 | X | − | ( | X | + | 501373 2 | ) | × | 3 10000 | = | 501373 2 |
| 方程左边 = | 2067 2180 | X | − | X | × | 3 10000 | − | 501373 2 | × | 3 10000 |
| = | 2067 2180 | X | − | X | × | 3 10000 | − | 1504119 20000 |
| = | 1033173 1090000 | X | − | 1504119 20000 |
1033173 1090000 | X | − | 1504119 20000 | = | 501373 2 |
1033173 1090000 | X | = | 501373 2 | + | 1504119 20000 |