| 3 | ( | x | + | 1 | ) | + | 2 | ÷ | 7 | × | ( | x | + | 1 | ) | = | 4 | ( | x | − | 1 | ) | + | 3 | ÷ | 1 | × | ( | x | − | 1 | ) |
| 方程左边 = | 3 | ( | x | + | 1 | ) | + | 2 7 | ( | x | + | 1 | ) |
| 3 | ( | x | + | 1 | ) | + | 2 7 | ( | x | + | 1 | ) | = | 4 | ( | x | − | 1 | ) | + | 3 | ÷ | 1 | × | ( | x | − | 1 | ) |
| 方程左边 = | 3 | x | + | 3 | × | 1 | + | 2 7 | ( | x | + | 1 | ) |
| = | 3 | x | + | 3 | + | 2 7 | ( | x | + | 1 | ) |
| = | 3 | x | + | 3 | + | 2 7 | x | + | 2 7 | × | 1 |
| = | 3 | x | + | 3 | + | 2 7 | x | + | 2 7 |
| = | 23 7 | x | + | 23 7 |
23 7 | x | + | 23 7 | = | 4 | ( | x | − | 1 | ) | + | 3 | ÷ | 1 | × | ( | x | − | 1 | ) |
| 方程右边 = | 4 | ( | x | − | 1 | ) | + | 3 | ( | x | − | 1 | ) |
23 7 | x | + | 23 7 | = | 4 | ( | x | − | 1 | ) | + | 3 | ( | x | − | 1 | ) |
| 方程右边 = | 4 | x | − | 4 | × | 1 | + | 3 | ( | x | − | 1 | ) |
| = | 4 | x | − | 4 | + | 3 | ( | x | − | 1 | ) |
| = | 4 | x | − | 4 | + | 3 | x | − | 3 | × | 1 |
| = | 4 | x | − | 4 | + | 3 | x | − | 3 |
| = | 7 | x | − | 7 |
23 7 | x | + | 23 7 | = | 7 | x | − | 7 |
23 7 | x | − | 7 | x | = | - | 7 | − | 23 7 |
| - | 26 7 | x | = | - | 7 | − | 23 7 |
| - | 26 7 | x | = | - | 72 7 |
72 7 | = | 26 7 | x |
26 7 | x | = | 72 7 |
| x | = | 72 7 | ÷ | 26 7 |
| = | 72 7 | × | 7 26 |
| = | 36 | × | 1 13 |
| x | = | 36 13 |
| x | = | 2.769231 |