| ( | 30 | − | x | ) | ÷ | 140000 | = | 1 2 | × | 23 10 | × | 2 | ( | - | x | + | 3 2 | ) | ( | 1 | + | x | ÷ | 50 | ) |
| 方程左边 = | 30 | × | 1 140000 | − | x | × | 1 140000 |
| = | 3 14000 | − | x | × | 1 140000 |
3 14000 | − | 1 140000 | x | = | 1 2 | × | 23 10 | × | 2 | ( | - | x | + | 3 2 | ) | ( | 1 | + | x | ÷ | 50 | ) |
| 方程右边 = | 23 10 | ( | - | x | + | 3 2 | ) | ( | 1 | + | x | ÷ | 50 | ) |
3 14000 | − | 1 140000 | x | = | 23 10 | ( | - | x | + | 3 2 | ) | ( | 1 | + | x | ÷ | 50 | ) |
| 方程右边 = | - | 23 10 | x | ( | 1 | + | x | ÷ | 50 | ) | + | 23 10 | × | 3 2 | ( | 1 | + | x | ÷ | 50 | ) |
| = | - | 23 10 | x | ( | 1 | + | x | ÷ | 50 | ) | + | 69 20 | ( | 1 | + | x | ÷ | 50 | ) |
| = | - | 23 10 | x | × | 1 | − | 23 10 | x | x | ÷ | 50 | + | 69 20 | ( | 1 | + | x | ÷ | 50 | ) |
| = | - | 23 10 | x | − | 23 500 | x | x | + | 69 20 | ( | 1 | + | x | ÷ | 50 | ) |
| = | - | 23 10 | x | − | 23 500 | x | x | + | 69 20 | × | 1 | + | 69 20 | x | ÷ | 50 |
| = | - | 23 10 | x | − | 23 500 | x | x | + | 69 20 | + | 69 1000 | x |
| = | - | 2231 1000 | x | − | 23 500 | x | x | + | 69 20 |
3 14000 | − | 1 140000 | x | = | - | 2231 1000 | x | − | 23 500 | x | x | + | 69 20 |