| - | 1647 2500 | x | + | 3 10 | × | 1 2 | + | 1 5 | ( | 1 2 | − | x | ) | = | 0 |
| 方程左边 = | - | 1647 2500 | x | + | 3 20 | + | 1 5 | ( | 1 2 | − | x | ) |
| - | 1647 2500 | x | + | 3 20 | + | 1 5 | ( | 1 2 | − | x | ) | = | 0 |
| 方程左边 = | - | 1647 2500 | x | + | 3 20 | + | 1 5 | × | 1 2 | − | 1 5 | x |
| = | - | 1647 2500 | x | + | 3 20 | + | 1 10 | − | 1 5 | x |
| = | - | 2147 2500 | x | + | 1 4 |
| - | 2147 2500 | x | + | 1 4 | = | 0 |
| - | 2147 2500 | x | = | 0 | − | 1 4 |
| - | 2147 2500 | x | = | - | 1 4 |
1 4 | = | 2147 2500 | x |
2147 2500 | x | = | 1 4 |
| x | = | 1 4 | ÷ | 2147 2500 |
| = | 1 4 | × | 2500 2147 |
| = | 1 | × | 625 2147 |
| x | = | 625 2147 |
| x | = | 0.291104 |