| ( | 2 | x | − | 4 | ) | ÷ | 7 | × | x | + | ( | x | − | 2 | ) | ( | 2 | x | + | 17 | ) | ÷ | 7 | = | ( | 2 | x | − | 4 | ) | ÷ | 7 | × | 8 | + | 5 | ( | x | − | 2 | ) |
| 方程左边 = | 2 | x | × | 1 7 | x | − | 4 | × | 1 7 | x | + | ( | x | − | 2 | ) | ( | 2 | x | + | 17 | ) | × | 1 7 |
| = | 2 7 | x | x | − | 4 7 | x | + | ( | x | − | 2 | ) | ( | 2 | x | + | 17 | ) | × | 1 7 |
| = | 2 7 | x | x | − | 4 7 | x | + | x | ( | 2 | x | + | 17 | ) | × | 1 7 | − | 2 | ( | 2 | x | + | 17 | ) | × | 1 7 |
| = | 2 7 | x | x | − | 4 7 | x | + | x | ( | 2 | x | + | 17 | ) | × | 1 7 | − | 2 7 | ( | 2 | x | + | 17 | ) |
| = | 2 7 | x | x | − | 4 7 | x | + | x | × | 2 | x | × | 1 7 | + | x | × | 17 | × | 1 7 |
| = | 2 7 | x | x | − | 4 7 | x | + | x | × | 2 7 | x | + | x | × | 17 7 | − | 2 7 | ( | 2 | x | + | 17 | ) |
| = | 2 7 | x | x | + | 13 7 | x | + | x | × | 2 7 | x | − | 2 7 | ( | 2 | x | + | 17 | ) |
| = | 2 7 | x | x | + | 13 7 | x | + | x | × | 2 7 | x | − | 2 7 | × | 2 | x | − | 2 7 |
| = | 2 7 | x | x | + | 13 7 | x | + | x | × | 2 7 | x | − | 4 7 | x | − | 34 7 |
| = | 2 7 | x | x | + | 9 7 | x | + | x | × | 2 7 | x | − | 34 7 |
2 7 | x | x | + | 9 7 | x | + | x | × | 2 7 | x | − | 34 7 | = | ( | 2 | x | − | 4 | ) | ÷ | 7 | × | 8 | + | 5 | ( | x | − | 2 | ) |
| 方程右边 = | ( | 2 | x | − | 4 | ) | × | 8 7 | + | 5 | ( | x | − | 2 | ) |
2 7 | x | x | + | 9 7 | x | + | x | × | 2 7 | x | − | 34 7 | = | ( | 2 | x | − | 4 | ) | × | 8 7 | + | 5 | ( | x | − | 2 | ) |
| 方程右边 = | 2 | x | × | 8 7 | − | 4 | × | 8 7 | + | 5 | ( | x | − | 2 | ) |
| = | 16 7 | x | − | 32 7 | + | 5 | ( | x | − | 2 | ) |
| = | 16 7 | x | − | 32 7 | + | 5 | x | − | 5 | × | 2 |
| = | 16 7 | x | − | 32 7 | + | 5 | x | − | 10 |
| = | 51 7 | x | − | 102 7 |
2 7 | x | x | + | 9 7 | x | + | x | × | 2 7 | x | − | 34 7 | = | 51 7 | x | − | 102 7 |
| x2= | 17 2 |