| - | ( | 9 | ÷ | 14 | ) | ( | l | ( | 9 | ÷ | 14 | ) | ) | − | ( | 5 | ÷ | 14 | ) | ( | l | ( | 5 | ÷ | 14 | ) | ) | = | 0 |
| 方程左边 = | - | 9 | ÷ | 14 | × | ( | l | ( | 9 | ÷ | 14 | ) | ) | − | ( | 5 | ÷ | 14 | ) | ( | l | ( | 5 | ÷ | 14 | ) | ) |
| = | - | 9 14 | ( | l | ( | 9 | ÷ | 14 | ) | ) | − | ( | 5 | ÷ | 14 | ) | ( | l | ( | 5 | ÷ | 14 | ) | ) |
| = | - | 9 14 | l | ( | 9 | ÷ | 14 | ) | − | ( | 5 | ÷ | 14 | ) | ( | l | ( | 5 | ÷ | 14 | ) | ) |
| = | - | 9 14 | l | × | 9 | ÷ | 14 | − | ( | 5 | ÷ | 14 | ) | ( | l | ( | 5 | ÷ | 14 | ) | ) |
| = | - | 81 196 | l | − | ( | 5 | ÷ | 14 | ) | ( | l | ( | 5 | ÷ | 14 | ) | ) |
| = | - | 81 196 | l | − | 5 | ÷ | 14 | × | ( | l | ( | 5 | ÷ | 14 | ) | ) |
| = | - | 81 196 | l | − | 5 14 | ( | l | ( | 5 | ÷ | 14 | ) | ) |
| = | - | 81 196 | l | − | 5 14 | l | ( | 5 | ÷ | 14 | ) |
| = | - | 81 196 | l | − | 5 14 | l | × | 5 | ÷ | 14 |
| = | - | 81 196 | l | − | 25 196 | l |
| = | - | 53 98 | l |
| - | 53 98 | l | = | 0 |
| - | 0 | = | 53 98 | l |
53 98 | l | = | - | 0 |
| l | = | - | 0 | ÷ | 53 98 |
| = | - | 0 | × | 98 53 |
| l | = | 0 |