| x | − | x | ÷ | 21 20 | × | 1 20 | − | x | ÷ | 21 20 | × | 1 20 | × | 3 25 | − | x | × | 1 2000 | − | ( | x | − | x | ÷ | 21 20 | × | 1 20 | − | 2500 | ) | × | 5 100 | = | 4500 |
| 方程左边 = | x | − | x | × | 1 21 | − | x | × | 1 175 | − | x | × | 1 2000 | − | ( | x | − | x | ÷ | 21 20 | × | 1 20 | − | 2500 | ) | × | 5 100 |
| = | 5677 6000 | x | − | ( | x | − | x | ÷ | 21 20 | × | 1 20 | − | 2500 | ) | × | 5 100 |
5677 6000 | x | − | ( | x | − | x | ÷ | 21 20 | × | 1 20 | − | 2500 | ) | × | 5 100 | = | 4500 |
| 方程左边 = | 5677 6000 | x | − | x | × | 5 100 | + | x | ÷ | 21 20 | × | 1 20 | × | 5 100 | + | 2500 | × | 5 100 |
| = | 5677 6000 | x | − | x | × | 5 100 | + | x | × | 1 420 | + | 125 |
| = | 37739 42000 | x | + | 125 |
37739 42000 | x | + | 125 | = | 4500 |
37739 42000 | x | = | 4500 | − | 125 |
37739 42000 | x | = | 4375 |
| x | = | 4375 | ÷ | 37739 42000 |
| = | 4375 | × | 42000 37739 |
| x | = | 183750000 37739 |
| x | = | 4868.968441 |