| 2 | t | − | 3 | ÷ | 5 | × | ( | 7 | − | 5 | t | ) | = | 4 | ÷ | 5 | × | ( | 7 | − | 5 | t | ) |
| 方程左边 = | 2 | t | − | 3 5 | ( | 7 | − | 5 | t | ) |
| 2 | t | − | 3 5 | ( | 7 | − | 5 | t | ) | = | 4 | ÷ | 5 | × | ( | 7 | − | 5 | t | ) |
| 方程左边 = | 2 | t | − | 3 5 | × | 7 | + | 3 5 | × | 5 | t |
| = | 2 | t | − | 21 5 | + | 3 | t |
| = | 5 | t | − | 21 5 |
| 5 | t | − | 21 5 | = | 4 | ÷ | 5 | × | ( | 7 | − | 5 | t | ) |
| 方程右边 = | 4 5 | ( | 7 | − | 5 | t | ) |
| 5 | t | − | 21 5 | = | 4 5 | ( | 7 | − | 5 | t | ) |
| 方程右边 = | 4 5 | × | 7 | − | 4 5 | × | 5 | t |
| = | 28 5 | − | 4 | t |
| 5 | t | − | 21 5 | = | 28 5 | − | 4 | t |
| 5 | t | + | 4 | t | = | 28 5 | + | 21 5 |
| 9 | t | = | 28 5 | + | 21 5 |
| 9 | t | = | 49 5 |
| t | = | 49 5 | ÷ | 9 |
| = | 49 5 | × | 1 9 |
| t | = | 49 45 |
| t | = | 1.088889 |