| ( | 3000 | + | x | ) | ( | 100 | − | x | ÷ | 50 | ) | − | 150 | ( | 100 | − | x | ÷ | 50 | ) | − | 50 | ( | 100 | − | 100 | + | x | ÷ | 50 | ) | = | 306600 |
| 方程左边 = | 3000 | ( | 100 | − | x | ÷ | 50 | ) | + | x | ( | 100 | − | x | ÷ | 50 | ) | − | 150 | ( | 100 | − | x | ÷ | 50 | ) | − | 50 | ( | 100 | − | 100 | + | x | ÷ | 50 | ) |
| = | 3000 | × | 100 | − | 3000 | x | ÷ | 50 | + | x | ( | 100 | − | x | ÷ | 50 | ) | − | 150 | ( | 100 | − | x | ÷ | 50 | ) | − | 50 | ( | 100 | − | 100 | + | x | ÷ | 50 | ) |
| = | 300000 | − | 60 | x | + | x | ( | 100 | − | x | ÷ | 50 | ) | − | 150 | ( | 100 | − | x | ÷ | 50 | ) | − | 50 | ( | 100 | − | 100 | + | x | ÷ | 50 | ) |
| = | 300000 | − | 60 | x | + | x | × | 100 | − | x | x | ÷ | 50 | − | 150 | ( | 100 | − | x | ÷ | 50 | ) | − | 50 | ( | 100 | − | 100 | + | x | ÷ | 50 | ) |
| = | 300000 | + | 40 | x | − | x | x | × | 1 50 | − | 150 | ( | 100 | − | x | ÷ | 50 | ) | − | 50 | ( | 100 | − | 100 | + | x | ÷ | 50 | ) |
| = | 300000 | + | 40 | x | − | x | x | × | 1 50 | − | 150 | × | 100 | + | 150 | x | ÷ | 50 | − | 50 |
| = | 300000 | + | 40 | x | − | x | x | × | 1 50 | − | 15000 | + | 3 | x | − | 50 | ( | 100 | − | 100 | + | x | ÷ | 50 | ) |
| = | 285000 | + | 43 | x | − | x | x | × | 1 50 | − | 50 | ( | 100 | − | 100 | + | x | ÷ | 50 | ) |
| = | 285000 | + | 43 | x | − | x | x | × | 1 50 | − | 50 | × | 100 | + | 50 | × | 100 | − | 50 | x |
| = | 285000 | + | 43 | x | − | x | x | × | 1 50 | − | 5000 | + | 5000 | − | 1 | x |
| = | 285000 | + | 42 | x | − | x | x | × | 1 50 |
| 285000 | + | 42 | x | − | x | x | × | 1 50 | = | 306600 |