| x | − | x | ÷ | 21 20 | × | 1 20 | − | x | ÷ | 21 20 | × | 3 25 | − | x | × | 1 2000 | − | ( | x | − | x | ÷ | 21 20 | × | 1 20 | ) | × | 5 100 | = | 4500 |
| 方程左边 = | x | − | x | × | 1 21 | − | x | × | 4 35 | − | x | × | 1 2000 | − | ( | x | − | x | ÷ | 21 20 | × | 1 20 | ) | × | 5 100 |
| = | 35179 42000 | x | − | ( | x | − | x | ÷ | 21 20 | × | 1 20 | ) | × | 5 100 |
35179 42000 | x | − | ( | x | − | x | ÷ | 21 20 | × | 1 20 | ) | × | 5 100 | = | 4500 |
| 方程左边 = | 35179 42000 | x | − | x | × | 5 100 | + | x | ÷ | 21 20 | × | 1 20 | × | 5 100 |
| = | 35179 42000 | x | − | x | × | 5 100 | + | x | × | 1 420 |
| = | 33179 42000 | x |
33179 42000 | x | = | 4500 |
| x | = | 4500 | ÷ | 33179 42000 |
| = | 4500 | × | 42000 33179 |
| x | = | 189000000 33179 |
| x | = | 5696.374213 |