| ( | 47 | − | 42 | ) | ÷ | ( | 42 | − | 34 | ) | = | ( | 70 | − | t | ) | ÷ | ( | t | − | 56 | ) |
| 方程两边同时乘以: | ( | 42 | − | 34 | ) | , | ( | t | − | 56 | ) |
| ( | 47 | − | 42 | ) | ( | t | − | 56 | ) | = | ( | 70 | − | t | ) | ( | 42 | − | 34 | ) |
| 47 | ( | t | − | 56 | ) | − | 42 | ( | t | − | 56 | ) | = | ( | 70 | − | t | ) | ( | 42 | − | 34 | ) |
| 47 | ( | t | − | 56 | ) | − | 42 | ( | t | − | 56 | ) | = | 70 | ( | 42 | − | 34 | ) | − | t | ( | 42 | − | 34 | ) |
| 47 | t | − | 47 | × | 56 | − | 42 | ( | t | − | 56 | ) | = | 70 | ( | 42 | − | 34 | ) | − | t | ( | 42 | − | 34 | ) |
| 47 | t | − | 47 | × | 56 | − | 42 | ( | t | − | 56 | ) | = | 70 | × | 42 | − | 70 | × | 34 | − | t | ( | 42 | − | 34 | ) |
| 47 | t | − | 2632 | − | 42 | ( | t | − | 56 | ) | = | 2940 | − | 2380 | − | t | ( | 42 | − | 34 | ) |
| 47 | t | − | 2632 | − | 42 | ( | t | − | 56 | ) | = | 560 | − | t | ( | 42 | − | 34 | ) |
| 47 | t | − | 2632 | − | 42 | t | + | 42 | × | 56 | = | 560 | − | t | ( | 42 | − | 34 | ) |
| 47 | t | − | 2632 | − | 42 | t | + | 42 | × | 56 | = | 560 | − | t | × | 42 | + | t | × | 34 |
| 47 | t | − | 2632 | − | 42 | t | + | 2352 | = | 560 | − | t | × | 42 | + | t | × | 34 |
| 5 | t | − | 280 | = | 560 | − | 8 | t |
| 5 | t | + | 8 | t | = | 560 | + | 280 |
| 13 | t | = | 560 | + | 280 |
| 13 | t | = | 840 |
| t | = | 840 | ÷ | 13 |
| = | 840 | × | 1 13 |
| t | = | 840 13 |
| t | = | 64.615385 |