| ( | 33 | − | 31 | ) | ÷ | ( | 31 | − | 28 | ) | = | ( | 55 | − | t | ) | ÷ | ( | t | − | 41 | ) |
| 方程两边同时乘以: | ( | 31 | − | 28 | ) | , | ( | t | − | 41 | ) |
| ( | 33 | − | 31 | ) | ( | t | − | 41 | ) | = | ( | 55 | − | t | ) | ( | 31 | − | 28 | ) |
| 33 | ( | t | − | 41 | ) | − | 31 | ( | t | − | 41 | ) | = | ( | 55 | − | t | ) | ( | 31 | − | 28 | ) |
| 33 | ( | t | − | 41 | ) | − | 31 | ( | t | − | 41 | ) | = | 55 | ( | 31 | − | 28 | ) | − | t | ( | 31 | − | 28 | ) |
| 33 | t | − | 33 | × | 41 | − | 31 | ( | t | − | 41 | ) | = | 55 | ( | 31 | − | 28 | ) | − | t | ( | 31 | − | 28 | ) |
| 33 | t | − | 33 | × | 41 | − | 31 | ( | t | − | 41 | ) | = | 55 | × | 31 | − | 55 | × | 28 | − | t | ( | 31 | − | 28 | ) |
| 33 | t | − | 1353 | − | 31 | ( | t | − | 41 | ) | = | 1705 | − | 1540 | − | t | ( | 31 | − | 28 | ) |
| 33 | t | − | 1353 | − | 31 | ( | t | − | 41 | ) | = | 165 | − | t | ( | 31 | − | 28 | ) |
| 33 | t | − | 1353 | − | 31 | t | + | 31 | × | 41 | = | 165 | − | t | ( | 31 | − | 28 | ) |
| 33 | t | − | 1353 | − | 31 | t | + | 31 | × | 41 | = | 165 | − | t | × | 31 | + | t | × | 28 |
| 33 | t | − | 1353 | − | 31 | t | + | 1271 | = | 165 | − | t | × | 31 | + | t | × | 28 |
| 2 | t | − | 82 | = | 165 | − | 3 | t |
| 2 | t | + | 3 | t | = | 165 | + | 82 |
| 5 | t | = | 165 | + | 82 |
| 5 | t | = | 247 |
| t | = | 247 | ÷ | 5 |
| = | 247 | × | 1 5 |
| t | = | 247 5 |
| t | = | 49.4 |