| 5 | ÷ | ( | 2 | t | − | 5 | ) | = | 4 | ÷ | ( | 4 | − | t | ) |
| 方程两边同时乘以: | ( | 2 | t | − | 5 | ) | , | ( | 4 | − | t | ) |
| 5 | ( | 4 | − | t | ) | = | 4 | ( | 2 | t | − | 5 | ) |
| 5 | × | 4 | − | 5 | t | = | 4 | ( | 2 | t | − | 5 | ) |
| 5 | × | 4 | − | 5 | t | = | 4 | × | 2 | t | − | 4 | × | 5 |
| 20 | − | 5 | t | = | 8 | t | − | 20 |
| - | 5 | t | − | 8 | t | = | - | 20 | − | 20 |
| - | 13 | t | = | - | 20 | − | 20 |
| - | 13 | t | = | - | 40 |
| 40 | = | 13 | t |
| 13 | t | = | 40 |
| t | = | 40 | ÷ | 13 |
| = | 40 | × | 1 13 |
| t | = | 40 13 |
| t | = | 3.076923 |