| ( | 39 | − | 35 | ) | ÷ | ( | 35 | − | 32 | ) | = | ( | 70 | − | t | ) | ÷ | ( | t | − | 56 | ) |
| 方程两边同时乘以: | ( | 35 | − | 32 | ) | , | ( | t | − | 56 | ) |
| ( | 39 | − | 35 | ) | ( | t | − | 56 | ) | = | ( | 70 | − | t | ) | ( | 35 | − | 32 | ) |
| 39 | ( | t | − | 56 | ) | − | 35 | ( | t | − | 56 | ) | = | ( | 70 | − | t | ) | ( | 35 | − | 32 | ) |
| 39 | ( | t | − | 56 | ) | − | 35 | ( | t | − | 56 | ) | = | 70 | ( | 35 | − | 32 | ) | − | t | ( | 35 | − | 32 | ) |
| 39 | t | − | 39 | × | 56 | − | 35 | ( | t | − | 56 | ) | = | 70 | ( | 35 | − | 32 | ) | − | t | ( | 35 | − | 32 | ) |
| 39 | t | − | 39 | × | 56 | − | 35 | ( | t | − | 56 | ) | = | 70 | × | 35 | − | 70 | × | 32 | − | t | ( | 35 | − | 32 | ) |
| 39 | t | − | 2184 | − | 35 | ( | t | − | 56 | ) | = | 2450 | − | 2240 | − | t | ( | 35 | − | 32 | ) |
| 39 | t | − | 2184 | − | 35 | ( | t | − | 56 | ) | = | 210 | − | t | ( | 35 | − | 32 | ) |
| 39 | t | − | 2184 | − | 35 | t | + | 35 | × | 56 | = | 210 | − | t | ( | 35 | − | 32 | ) |
| 39 | t | − | 2184 | − | 35 | t | + | 35 | × | 56 | = | 210 | − | t | × | 35 | + | t | × | 32 |
| 39 | t | − | 2184 | − | 35 | t | + | 1960 | = | 210 | − | t | × | 35 | + | t | × | 32 |
| 4 | t | − | 224 | = | 210 | − | 3 | t |
| 4 | t | + | 3 | t | = | 210 | + | 224 |
| 7 | t | = | 210 | + | 224 |
| 7 | t | = | 434 |
| t | = | 434 | ÷ | 7 |
| = | 434 | × | 1 7 |
| = | 62 | × | 1 |
| t | = | 62 |