8129 10000 | x | + | 1 | − | x | = | 249 250 |
| 方程左边 = | - | 1871 10000 | x | + | 1 |
| - | 1871 10000 | x | + | 1 | = | 249 250 |
| - | 1871 10000 | x | = | 249 250 | − | 1 |
| - | 1871 10000 | x | = | - | 1 250 |
1 250 | = | 1871 10000 | x |
1871 10000 | x | = | 1 250 |
| x | = | 1 250 | ÷ | 1871 10000 |
| = | 1 250 | × | 10000 1871 |
| = | 1 | × | 40 1871 |
| x | = | 40 1871 |
| x | = | 0.021379 |