1383 10 | × | 1000000 | = | 119 10 | × | 200 | x | ( | 80 | − | 1 2 | x | ) |
| 方程左边 = | 138300000 |
| 138300000 | = | 119 10 | × | 200 | x | ( | 80 | − | 1 2 | x | ) |
| 方程右边 = | 2380 | x | ( | 80 | − | 1 2 | x | ) |
| 138300000 | = | 2380 | x | ( | 80 | − | 1 2 | x | ) |
| 方程右边 = | 2380 | x | × | 80 | − | 2380 | x | × | 1 2 | x |
| = | 190400 | x | − | 1190 | x | x |
| 138300000 | = | 190400 | x | − | 1190 | x | x |