| 5 | ÷ | ( | 4 | − | t | ) | = | 4 | ÷ | ( | 2 | t | − | 5 | ) |
| 方程两边同时乘以: | ( | 4 | − | t | ) | , | ( | 2 | t | − | 5 | ) |
| 5 | ( | 2 | t | − | 5 | ) | = | 4 | ( | 4 | − | t | ) |
| 5 | × | 2 | t | − | 5 | × | 5 | = | 4 | ( | 4 | − | t | ) |
| 5 | × | 2 | t | − | 5 | × | 5 | = | 4 | × | 4 | − | 4 | t |
| 10 | t | − | 25 | = | 16 | − | 4 | t |
| 10 | t | + | 4 | t | = | 16 | + | 25 |
| 14 | t | = | 16 | + | 25 |
| 14 | t | = | 41 |
| t | = | 41 | ÷ | 14 |
| = | 41 | × | 1 14 |
| t | = | 41 14 |
| t | = | 2.928571 |