| ( | 125 | ÷ | 4 | − | ( | 5 | ÷ | 2 | ) | t | − | 10 | ) | × | 5 | ÷ | 2 | × | 1 | ÷ | 2 | = | 40 |
| 方程左边 = | ( | 125 | ÷ | 4 | − | ( | 5 | ÷ | 2 | ) | t | − | 10 | ) | × | 5 4 |
| ( | 125 | ÷ | 4 | − | ( | 5 | ÷ | 2 | ) | t | − | 10 | ) | × | 5 4 | = | 40 |
| 方程左边 = | 125 | ÷ | 4 | × | 5 4 | − | ( | 5 | ÷ | 2 | ) | t | × | 5 4 | − | 10 | × | 5 4 |
| = | 625 16 | − | ( | 5 | ÷ | 2 | ) | t | × | 5 4 | − | 25 2 |
| = | 425 16 | − | ( | 5 | ÷ | 2 | ) | t | × | 5 4 |
| = | 425 16 | − | 5 | ÷ | 2 | × | t | × | 5 4 |
| = | 425 16 | − | 25 8 | t |
425 16 | − | 25 8 | t | = | 40 |
| - | 25 8 | t | = | 40 | − | 425 16 |
| - | 25 8 | t | = | 215 16 |
| - | 215 16 | = | 25 8 | t |
25 8 | t | = | - | 215 16 |
| t | = | - | 215 16 | ÷ | 25 8 |
| = | - | 215 16 | × | 8 25 |
| = | - | 43 2 | × | 1 5 |
| t | = | - | 43 10 |
| t | = | - 4.3 |