| ( | 58 | − | 40 | ) | ÷ | ( | 40 | − | 26 | ) | = | ( | 80 | − | t | ) | ÷ | ( | t | − | 56 | ) |
| 方程两边同时乘以: | ( | 40 | − | 26 | ) | , | ( | t | − | 56 | ) |
| ( | 58 | − | 40 | ) | ( | t | − | 56 | ) | = | ( | 80 | − | t | ) | ( | 40 | − | 26 | ) |
| 58 | ( | t | − | 56 | ) | − | 40 | ( | t | − | 56 | ) | = | ( | 80 | − | t | ) | ( | 40 | − | 26 | ) |
| 58 | ( | t | − | 56 | ) | − | 40 | ( | t | − | 56 | ) | = | 80 | ( | 40 | − | 26 | ) | − | t | ( | 40 | − | 26 | ) |
| 58 | t | − | 58 | × | 56 | − | 40 | ( | t | − | 56 | ) | = | 80 | ( | 40 | − | 26 | ) | − | t | ( | 40 | − | 26 | ) |
| 58 | t | − | 58 | × | 56 | − | 40 | ( | t | − | 56 | ) | = | 80 | × | 40 | − | 80 | × | 26 | − | t | ( | 40 | − | 26 | ) |
| 58 | t | − | 3248 | − | 40 | ( | t | − | 56 | ) | = | 3200 | − | 2080 | − | t | ( | 40 | − | 26 | ) |
| 58 | t | − | 3248 | − | 40 | ( | t | − | 56 | ) | = | 1120 | − | t | ( | 40 | − | 26 | ) |
| 58 | t | − | 3248 | − | 40 | t | + | 40 | × | 56 | = | 1120 | − | t | ( | 40 | − | 26 | ) |
| 58 | t | − | 3248 | − | 40 | t | + | 40 | × | 56 | = | 1120 | − | t | × | 40 | + | t | × | 26 |
| 58 | t | − | 3248 | − | 40 | t | + | 2240 | = | 1120 | − | t | × | 40 | + | t | × | 26 |
| 18 | t | − | 1008 | = | 1120 | − | 14 | t |
| 18 | t | + | 14 | t | = | 1120 | + | 1008 |
| 32 | t | = | 1120 | + | 1008 |
| 32 | t | = | 2128 |
| t | = | 2128 | ÷ | 32 |
| = | 2128 | × | 1 32 |
| = | 133 | × | 1 2 |
| t | = | 133 2 |
| t | = | 66.5 |