167 10 | × | 400 | x | ( | 330 | − | x | ÷ | 2 | ) | + | 3079 5 | × | 360 | × | 290 | = | 717000 |
| 方程左边 = | 6680 | x | ( | 330 | − | x | ÷ | 2 | ) | + | 64289520 |
| 6680 | x | ( | 330 | − | x | ÷ | 2 | ) | + | 64289520 | = | 717000 |
| 方程左边 = | 6680 | x | × | 330 | − | 6680 | x | x | ÷ | 2 | + | 64289520 |
| = | 2204400 | x | − | 3340 | x | x | + | 64289520 |
| 2204400 | x | − | 3340 | x | x | + | 64289520 | = | 717000 |