| x | − | ( | x | × | 4 5 | ) | − | ( | x | × | 17 20 | ) | − | 15 | = | 348 |
| 方程左边 = | x | − | x | × | 4 5 | − | ( | x | × | 17 20 | ) | − | 15 |
| = | 1 5 | x | − | ( | x | × | 17 20 | ) | − | 15 |
| = | 1 5 | x | − | x | × | 17 20 | − | 15 |
| = | - | 13 20 | x | − | 15 |
| - | 13 20 | x | − | 15 | = | 348 |
| - | 13 20 | x | = | 348 | + | 15 |
| - | 13 20 | x | = | 363 |
| - | 363 | = | 13 20 | x |
13 20 | x | = | - | 363 |
| x | = | - | 363 | ÷ | 13 20 |
| = | - | 363 | × | 20 13 |
| x | = | - | 7260 13 |
| x | = | - 558.461538 |