12778 25 | × | 100000 | = | 69 5 | × | 1400 | x | ( | 1250 | − | x | ÷ | 2 | ) |
| 方程左边 = | 51112000 |
| 51112000 | = | 69 5 | × | 1400 | x | ( | 1250 | − | x | ÷ | 2 | ) |
| 方程右边 = | 19320 | x | ( | 1250 | − | x | ÷ | 2 | ) |
| 51112000 | = | 19320 | x | ( | 1250 | − | x | ÷ | 2 | ) |
| 方程右边 = | 19320 | x | × | 1250 | − | 19320 | x | x | ÷ | 2 |
| = | 24150000 | x | − | 9660 | x | x |
| 51112000 | = | 24150000 | x | − | 9660 | x | x |