| a | = | ( | a | − | 4 100 | ) | × | 15 100 | − | ( | a | − | 23 2 | ) |
| 方程右边 = | a | × | 15 100 | − | 4 100 | × | 15 100 | − | ( | a | − | 23 2 | ) |
| = | a | × | 15 100 | − | 3 500 | − | ( | a | − | 23 2 | ) |
| = | 15 100 | a | − | 3 500 | − | a | + | 23 2 |
| = | - | 17 20 | a | + | 5747 500 |
| a | = | - | 17 20 | a | + | 5747 500 |
| a | + | 17 20 | a | = | 5747 500 |
37 20 | a | = | 5747 500 |
| a | = | 5747 500 | ÷ | 37 20 |
| = | 5747 500 | × | 20 37 |
| = | 5747 25 | × | 1 37 |
| a | = | 5747 925 |
| a | = | 6.212973 |