| 240 | × | 10000000 | = | 69 5 | × | 300 | x | ( | 590 | − | 1 2 | x | ) |
| 方程左边 = | 2400000000 |
| 2400000000 | = | 69 5 | × | 300 | x | ( | 590 | − | 1 2 | x | ) |
| 方程右边 = | 4140 | x | ( | 590 | − | 1 2 | x | ) |
| 2400000000 | = | 4140 | x | ( | 590 | − | 1 2 | x | ) |
| 方程右边 = | 4140 | x | × | 590 | − | 4140 | x | × | 1 2 | x |
| = | 2442600 | x | − | 2070 | x | x |
| 2400000000 | = | 2442600 | x | − | 2070 | x | x |