| 1981 | a | + | 535 | ( | 7610 | − | a | ) | = | 7610 | × | 912 |
| 方程左边 = | 1981 | a | + | 535 | × | 7610 | − | 535 | a |
| = | 1981 | a | + | 4071350 | − | 535 | a |
| = | 1446 | a | + | 4071350 |
| 1446 | a | + | 4071350 | = | 7610 | × | 912 |
| 方程右边 = | 6940320 |
| 1446 | a | + | 4071350 | = | 6940320 |
| 1446 | a | = | 6940320 | − | 4071350 |
| 1446 | a | = | 2868970 |
| a | = | 2868970 | ÷ | 1446 |
| = | 2868970 | × | 1 1446 |
| = | 1434485 | × | 1 723 |
| a | = | 1434485 723 |
| a | = | 1984.073306 |