| ( | 400 | − | x | ) | ( | 10 | + | 3 | ÷ | 25 | × | x | ) | = | 4600 |
| 方程左边 = | 400 | ( | 10 | + | 3 | ÷ | 25 | × | x | ) | − | x | ( | 10 | + | 3 | ÷ | 25 | × | x | ) |
| = | 400 | × | 10 | + | 400 | × | 3 | ÷ | 25 | × | x | − | x | ( | 10 | + | 3 | ÷ | 25 | × | x | ) |
| = | 4000 | + | 48 | x | − | x | ( | 10 | + | 3 | ÷ | 25 | × | x | ) |
| = | 4000 | + | 48 | x | − | x | × | 10 | − | x | × | 3 | ÷ | 25 | × | x |
| = | 4000 | + | 48 | x | − | x | × | 10 | − | x | × | 3 25 | x |
| = | 4000 | + | 38 | x | − | x | × | 3 25 | x |
| 4000 | + | 38 | x | − | x | × | 3 25 | x | = | 4600 |
| x= | 50 3 |