| ( | 881 10000 | − | x | ) | x | × | 2491 100000 | = | 3 40 | ÷ | 399 5000 |
| 方程左边 = | 881 10000 | x | × | 2491 100000 | − | x | x | × | 2491 100000 |
| = | 2194571 1000000000 | x | − | x | x | × | 2491 100000 |
2194571 1000000000 | x | − | x | x | × | 2491 100000 | = | 3 40 | ÷ | 399 5000 |
| 方程右边 = | 125 133 |
2194571 1000000000 | x | − | x | x | × | 2491 100000 | = | 125 133 |