| ( | x | ÷ | 1 5 | ) | − | ( | 31 100 | x | − | 13 100 | ÷ | 3 100 | ) | = | 1 |
| 方程左边 = | x | ÷ | 1 5 | − | ( | 31 100 | x | − | 13 100 | ÷ | 3 100 | ) |
| = | 5 | x | − | 31 100 | x | + | 13 100 | ÷ | 3 100 |
| = | 5 | x | − | 31 100 | x | + | 13 3 |
| = | 469 100 | x | + | 13 3 |
469 100 | x | + | 13 3 | = | 1 |
469 100 | x | = | 1 | − | 13 3 |
469 100 | x | = | - | 10 3 |
| x | = | - | 10 3 | ÷ | 469 100 |
| = | - | 10 3 | × | 100 469 |
| x | = | - | 1000 1407 |
| x | = | - 0.710732 |