| ( | 30 | − | 27 | ) | ÷ | ( | 27 | − | 24 | ) | = | ( | 55 | − | t | ) | ÷ | ( | t | − | 41 | ) |
| 方程两边同时乘以: | ( | 27 | − | 24 | ) | , | ( | t | − | 41 | ) |
| ( | 30 | − | 27 | ) | ( | t | − | 41 | ) | = | ( | 55 | − | t | ) | ( | 27 | − | 24 | ) |
| 30 | ( | t | − | 41 | ) | − | 27 | ( | t | − | 41 | ) | = | ( | 55 | − | t | ) | ( | 27 | − | 24 | ) |
| 30 | ( | t | − | 41 | ) | − | 27 | ( | t | − | 41 | ) | = | 55 | ( | 27 | − | 24 | ) | − | t | ( | 27 | − | 24 | ) |
| 30 | t | − | 30 | × | 41 | − | 27 | ( | t | − | 41 | ) | = | 55 | ( | 27 | − | 24 | ) | − | t | ( | 27 | − | 24 | ) |
| 30 | t | − | 30 | × | 41 | − | 27 | ( | t | − | 41 | ) | = | 55 | × | 27 | − | 55 | × | 24 | − | t | ( | 27 | − | 24 | ) |
| 30 | t | − | 1230 | − | 27 | ( | t | − | 41 | ) | = | 1485 | − | 1320 | − | t | ( | 27 | − | 24 | ) |
| 30 | t | − | 1230 | − | 27 | ( | t | − | 41 | ) | = | 165 | − | t | ( | 27 | − | 24 | ) |
| 30 | t | − | 1230 | − | 27 | t | + | 27 | × | 41 | = | 165 | − | t | ( | 27 | − | 24 | ) |
| 30 | t | − | 1230 | − | 27 | t | + | 27 | × | 41 | = | 165 | − | t | × | 27 | + | t | × | 24 |
| 30 | t | − | 1230 | − | 27 | t | + | 1107 | = | 165 | − | t | × | 27 | + | t | × | 24 |
| 3 | t | − | 123 | = | 165 | − | 3 | t |
| 3 | t | + | 3 | t | = | 165 | + | 123 |
| 6 | t | = | 165 | + | 123 |
| 6 | t | = | 288 |
| t | = | 288 | ÷ | 6 |
| = | 288 | × | 1 6 |
| = | 48 | × | 1 |
| t | = | 48 |