8 100 | a | + | 24 100 | ( | 1 | − | a | ) | = | 0 |
| 方程左边 = | 8 100 | a | + | 24 100 | × | 1 | − | 24 100 | a |
| = | 8 100 | a | + | 6 25 | − | 24 100 | a |
| = | - | 4 25 | a | + | 6 25 |
| - | 4 25 | a | + | 6 25 | = | 0 |
| - | 4 25 | a | = | 0 | − | 6 25 |
| - | 4 25 | a | = | - | 6 25 |
6 25 | = | 4 25 | a |
4 25 | a | = | 6 25 |
| a | = | 6 25 | ÷ | 4 25 |
| = | 6 25 | × | 25 4 |
| = | 3 | × | 1 2 |
| a | = | 3 2 |
| a | = | 1.5 |