| 14000 | + | 19500 | + | 630 | ( | a | − | 20 | − | 30 | ) | − | 500 | a | = | 127000 |
| 方程左边 = | 33500 | + | 630 | ( | a | − | 20 | − | 30 | ) | − | 500 | a |
| 33500 | + | 630 | ( | a | − | 20 | − | 30 | ) | − | 500 | a | = | 127000 |
| 方程左边 = | 33500 | + | 630 | a | − | 630 | × | 20 | − | 630 | × | 30 | − | 500 | a |
| = | 33500 | + | 630 | a | − | 12600 | − | 18900 | − | 500 | a |
| = | 2000 | + | 130 | a |
| 2000 | + | 130 | a | = | 127000 |
| 130 | a | = | 127000 | − | 2000 |
| 130 | a | = | 125000 |
| a | = | 125000 | ÷ | 130 |
| = | 125000 | × | 1 130 |
| = | 12500 | × | 1 13 |
| a | = | 12500 13 |
| a | = | 961.538462 |