| ( | 200 | + | x | ) | ( | 64 | − | x | ÷ | 10 | ) | = | 14400 |
| 方程左边 = | 200 | ( | 64 | − | x | ÷ | 10 | ) | + | x | ( | 64 | − | x | ÷ | 10 | ) |
| = | 200 | × | 64 | − | 200 | x | ÷ | 10 | + | x | ( | 64 | − | x | ÷ | 10 | ) |
| = | 12800 | − | 20 | x | + | x | ( | 64 | − | x | ÷ | 10 | ) |
| = | 12800 | − | 20 | x | + | x | × | 64 | − | x | x | ÷ | 10 |
| = | 12800 | + | 44 | x | − | x | x | × | 1 10 |
| 12800 | + | 44 | x | − | x | x | × | 1 10 | = | 14400 |