| ( | 39 | − | 37 | ) | ÷ | ( | 37 | − | 32 | ) | = | ( | 70 | − | t | ) | ÷ | ( | t | − | 56 | ) |
| 方程两边同时乘以: | ( | 37 | − | 32 | ) | , | ( | t | − | 56 | ) |
| ( | 39 | − | 37 | ) | ( | t | − | 56 | ) | = | ( | 70 | − | t | ) | ( | 37 | − | 32 | ) |
| 39 | ( | t | − | 56 | ) | − | 37 | ( | t | − | 56 | ) | = | ( | 70 | − | t | ) | ( | 37 | − | 32 | ) |
| 39 | ( | t | − | 56 | ) | − | 37 | ( | t | − | 56 | ) | = | 70 | ( | 37 | − | 32 | ) | − | t | ( | 37 | − | 32 | ) |
| 39 | t | − | 39 | × | 56 | − | 37 | ( | t | − | 56 | ) | = | 70 | ( | 37 | − | 32 | ) | − | t | ( | 37 | − | 32 | ) |
| 39 | t | − | 39 | × | 56 | − | 37 | ( | t | − | 56 | ) | = | 70 | × | 37 | − | 70 | × | 32 | − | t | ( | 37 | − | 32 | ) |
| 39 | t | − | 2184 | − | 37 | ( | t | − | 56 | ) | = | 2590 | − | 2240 | − | t | ( | 37 | − | 32 | ) |
| 39 | t | − | 2184 | − | 37 | ( | t | − | 56 | ) | = | 350 | − | t | ( | 37 | − | 32 | ) |
| 39 | t | − | 2184 | − | 37 | t | + | 37 | × | 56 | = | 350 | − | t | ( | 37 | − | 32 | ) |
| 39 | t | − | 2184 | − | 37 | t | + | 37 | × | 56 | = | 350 | − | t | × | 37 | + | t | × | 32 |
| 39 | t | − | 2184 | − | 37 | t | + | 2072 | = | 350 | − | t | × | 37 | + | t | × | 32 |
| 2 | t | − | 112 | = | 350 | − | 5 | t |
| 2 | t | + | 5 | t | = | 350 | + | 112 |
| 7 | t | = | 350 | + | 112 |
| 7 | t | = | 462 |
| t | = | 462 | ÷ | 7 |
| = | 462 | × | 1 7 |
| = | 66 | × | 1 |
| t | = | 66 |