| 2 | ÷ | x | + | 1 | ÷ | ( | x | + | 3 | ) | + | 1 | ÷ | ( | x | + | 7 | ) | = | 1 | ÷ | ( | x | + | 1 | ) |
| 方程两边同时乘以: | x | , | ( | x | + | 1 | ) |
| 2 | ( | x | + | 1 | ) | + | 1 | ÷ | ( | x | + | 3 | ) | × | x | ( | x | + | 1 | ) | + | 1 | ÷ | ( | x | + | 7 | ) | × | x | ( | x | + | 1 | ) | = | 1 | x |
| 2 | x | + | 2 | × | 1 | + | 1 | ÷ | ( | x | + | 3 | ) | × | x | ( | x | + | 1 | ) | + | 1 | ÷ | ( | x | + | 7 | ) | × | x | ( | x | + | 1 | ) | = | 1 | x |
| 2 | x | + | 2 | + | 1 | ÷ | ( | x | + | 3 | ) | × | x | ( | x | + | 1 | ) | + | 1 | ÷ | ( | x | + | 7 | ) | × | x | ( | x | + | 1 | ) | = | 1 | x |
| 方程两边同时乘以: | ( | x | + | 3 | ) |
| 2 | x | ( | x | + | 3 | ) | + | 2 | ( | x | + | 3 | ) | + | 1 | x | ( | x | + | 1 | ) | + | 1 | ÷ | ( | x | + | 7 | ) | × | x | ( | x | + | 1 | ) | = | 1 | x | ( | x | + | 3 | ) |
| 2 | x | x | + | 2 | x | × | 3 | + | 2 | ( | x | + | 3 | ) | + | 1 | x | ( | x | + | 1 | ) | + | 1 | = | 1 | x | ( | x | + | 3 | ) |
| 2 | x | x | + | 2 | x | × | 3 | + | 2 | ( | x | + | 3 | ) | + | 1 | x | ( | x | + | 1 | ) | + | 1 | = | 1 | x | x | + | 1 | x | × | 3 |
| 2 | x | x | + | 6 | x | + | 2 | ( | x | + | 3 | ) | + | 1 | x | ( | x | + | 1 | ) | + | 1 | ÷ | ( | x | + | 7 | ) | = | 1 | x | x | + | 3 | x |
| 方程两边同时乘以: | ( | x | + | 7 | ) |
| 2 | x | x | ( | x | + | 7 | ) | + | 6 | x | ( | x | + | 7 | ) | + | 2 | ( | x | + | 3 | ) | ( | x | + | 7 | ) | + | 1 | x | = | 1 | x | x | ( | x | + | 7 | ) | + | 3 | x | ( | x | + | 7 | ) |
| 2 | x | x | x | + | 2 | x | x | × | 7 | + | 6 | x | ( | x | + | 7 | ) | + | 2 | = | 1 | x | x | ( | x | + | 7 | ) | + | 3 | x | ( | x | + | 7 | ) |
| 2 | x | x | x | + | 2 | x | x | × | 7 | + | 6 | x | ( | x | + | 7 | ) | + | 2 | = | 1 | x | x | x | + | 1 | x | x | × | 7 | + | 3 | x | ( | x | + | 7 | ) |
| 2 | x | x | x | + | 14 | x | x | + | 6 | x | ( | x | + | 7 | ) | + | 2 | ( | x | + | 3 | ) | = | 1 | x | x | x | + | 7 | x | x | + | 3 | x | ( | x | + | 7 | ) |
| 2 | x | x | x | + | 14 | x | x | + | 6 | x | x | + | 6 | x | = | 1 | x | x | x | + | 7 | x | x | + | 3 | x | ( | x | + | 7 | ) |
| 2 | x | x | x | + | 14 | x | x | + | 6 | x | x | + | 6 | x | = | 1 | x | x | x | + | 7 | x | x | + | 3 | x | x | + | 3 | x |
| 2 | x | x | x | + | 14 | x | x | + | 6 | x | x | + | 42 | x | = | 1 | x | x | x | + | 7 | x | x | + | 3 | x | x | + | 21 | x |
| 2 | x | x | x | + | 14 | x | x | + | 6 | x | x | + | 42 | x | = | 1 | x | x | x | + | 7 | x | x | + | 3 | x | x | + | 21 | x |
| 2 | x | x | x | + | 14 | x | x | + | 6 | x | x | + | 42 | x | = | 1 | x | x | x | + | 7 | x | x | + | 3 | x | x | + | 21 | x |
| 2 | x | x | x | + | 14 | x | x | + | 6 | x | x | + | 42 | x | = | 1 | x | x | x | + | 7 | x | x | + | 3 | x | x | + | 21 | x |
| 2 | x | x | x | + | 14 | x | x | + | 6 | x | x | + | 42 | x | = | 1 | x | x | x | + | 7 | x | x | + | 3 | x | x | + | 21 | x |
| 2 | x | x | x | + | 14 | x | x | + | 6 | x | x | + | 56 | x | = | 1 | x | x | x | + | 7 | x | x | + | 3 | x | x | + | 21 | x |
| 2 | x | x | x | + | 14 | x | x | + | 6 | x | x | + | 56 | x | = | 1 | x | x | x | + | 7 | x | x | + | 3 | x | x | + | 21 | x |
| 2 | x | x | x | + | 14 | x | x | + | 6 | x | x | + | 56 | x | = | 1 | x | x | x | + | 7 | x | x | + | 3 | x | x | + | 21 | x |
| 2 | x | x | x | + | 14 | x | x | + | 6 | x | x | + | 62 | x | = | 1 | x | x | x | + | 7 | x | x | + | 3 | x | x | + | 21 | x |