| a | + | ( | 64 25 | − | 243 10 | a | ) | ÷ | 9 | − | 5 4 | = | 0 |
| 方程左边 = | a | + | 64 25 | × | 1 9 | − | 243 10 | a | × | 1 9 | − | 5 4 |
| = | a | + | 64 225 | − | 27 10 | a | − | 5 4 |
| = | - | 17 10 | a | − | 869 900 |
| - | 17 10 | a | − | 869 900 | = | 0 |
| - | 17 10 | a | = | 0 | + | 869 900 |
| - | 17 10 | a | = | 869 900 |
| - | 869 900 | = | 17 10 | a |
17 10 | a | = | - | 869 900 |
| a | = | - | 869 900 | ÷ | 17 10 |
| = | - | 869 900 | × | 10 17 |
| = | - | 869 90 | × | 1 17 |
| a | = | - | 869 1530 |
| a | = | - 0.567974 |