| 7 | x | + | 5 | ÷ | ( | x | + | 3 | ) | × | ( | x | − | 4 | ) | = | 7 | x | − | 10 | ÷ | ( | x | − | 2 | ) | × | ( | x | − | 4 | ) |
| 方程两边同时乘以: | ( | x | + | 3 | ) | , | ( | x | − | 2 | ) |
| 7 | x | ( | x | + | 3 | ) | ( | x | − | 2 | ) | + | 5 | ( | x | − | 4 | ) | ( | x | − | 2 | ) | = | 7 | x | ( | x | + | 3 | ) | ( | x | − | 2 | ) | − | 10 | ( | x | − | 4 | ) | ( | x | + | 3 | ) |
| 7 | x | x | ( | x | − | 2 | ) | + | 7 | x | × | 3 | ( | x | − | 2 | ) | + | 5 | ( | x | − | 4 | ) | ( | x | − | 2 | ) | = | 7 | x | ( | x | + | 3 | ) | ( | x | − | 2 | ) | − | 10 | ( | x | − | 4 | ) | ( | x | + | 3 | ) |
| 7 | x | x | ( | x | − | 2 | ) | + | 7 | x | × | 3 | ( | x | − | 2 | ) | + | 5 | ( | x | − | 4 | ) | ( | x | − | 2 | ) | = | 7 | x | x | ( | x | − | 2 | ) | + | 7 | x | × | 3 | ( | x | − | 2 | ) | − | 10 | ( | x | − | 4 | ) | ( | x | + | 3 | ) |
| 7 | x | x | ( | x | − | 2 | ) | + | 21 | x | ( | x | − | 2 | ) | + | 5 | ( | x | − | 4 | ) | ( | x | − | 2 | ) | = | 7 | x | x | ( | x | − | 2 | ) | + | 21 | x | ( | x | − | 2 | ) | − | 10 | ( | x | − | 4 | ) | ( | x | + | 3 | ) |
| 7 | x | x | x | − | 7 | x | x | × | 2 | + | 21 | x | ( | x | − | 2 | ) | + | 5 | = | 7 | x | x | ( | x | − | 2 | ) | + | 21 | x | ( | x | − | 2 | ) | − | 10 | ( | x | − | 4 | ) | ( | x | + | 3 | ) |
| 7 | x | x | x | − | 7 | x | x | × | 2 | + | 21 | x | ( | x | − | 2 | ) | + | 5 | = | 7 | x | x | x | − | 7 | x | x | × | 2 | + | 21 | x | ( | x | − | 2 | ) | − | 10 |
| 7 | x | x | x | − | 14 | x | x | + | 21 | x | ( | x | − | 2 | ) | + | 5 | ( | x | − | 4 | ) | = | 7 | x | x | x | − | 14 | x | x | + | 21 | x | ( | x | − | 2 | ) | − | 10 | ( | x | − | 4 | ) |
| 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 21 | x | = | 7 | x | x | x | − | 14 | x | x | + | 21 | x | ( | x | − | 2 | ) | − | 10 | ( | x | − | 4 | ) |
| 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 21 | x | = | 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 21 | x |
| 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 42 | x | = | 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 42 | x |
| 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 42 | x | = | 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 42 | x |
| 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 42 | x | = | 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 42 | x |
| 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 42 | x | = | 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 42 | x |
| 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 42 | x | = | 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 42 | x |
| 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 42 | x | = | 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 42 | x |
| 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 42 | x | = | 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 42 | x |
| 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 52 | x | = | 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 72 | x |
| 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 52 | x | = | 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 72 | x |
| 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 52 | x | = | 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 72 | x |
| 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 52 | x | = | 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 72 | x |
| 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 72 | x | = | 7 | x | x | x | − | 14 | x | x | + | 21 | x | x | − | 32 | x |
| x1= | - | 4 3 |
| x2=4 |