2 5 | a | + | 8 | = | 9 25 | ( | 3 5 | a | + | 22 | ) |
| 方程右边 = | 9 25 | × | 3 5 | a | + | 9 25 | × | 22 |
| = | 27 125 | a | + | 198 25 |
2 5 | a | + | 8 | = | 27 125 | a | + | 198 25 |
2 5 | a | − | 27 125 | a | = | 198 25 | − | 8 |
23 125 | a | = | 198 25 | − | 8 |
23 125 | a | = | - | 2 25 |
| a | = | - | 2 25 | ÷ | 23 125 |
| = | - | 2 25 | × | 125 23 |
| = | - | 2 | × | 5 23 |
| a | = | - | 10 23 |
| a | = | - 0.434783 |