| 2500 | × | 1000000 | = | 69 5 | × | 1600 | × | 120 | ( | 1400 | − | x | ÷ | 2 | ) | x |
| 方程左边 = | 2500000000 |
| 2500000000 | = | 69 5 | × | 1600 | × | 120 | ( | 1400 | − | x | ÷ | 2 | ) | x |
| 方程右边 = | 2649600 | ( | 1400 | − | x | ÷ | 2 | ) | x |
| 2500000000 | = | 2649600 | ( | 1400 | − | x | ÷ | 2 | ) | x |
| 方程右边 = | 2649600 | × | 1400 | x | − | 2649600 | x | ÷ | 2 | × | x |
| = | 3709440000 | x | − | 1324800 | x | x |
| 2500000000 | = | 3709440000 | x | − | 1324800 | x | x |