| 8 | ( | 1 | − | 1 2 | x | ) | ( | 1 | + | x | ) | + | 9 | ( | 1 | + | 2 | x | ) | = | 18 | ( | 1 | + | 16 | ÷ | 15 | ) |
| 方程左边 = | 8 | × | 1 | ( | 1 | + | x | ) | − | 8 | × | 1 2 | x | ( | 1 | + | x | ) | + | 9 | ( | 1 | + | 2 | x | ) |
| = | 8 | ( | 1 | + | x | ) | − | 4 | x | ( | 1 | + | x | ) | + | 9 | ( | 1 | + | 2 | x | ) |
| = | 8 | × | 1 | + | 8 | x | − | 4 | x | ( | 1 | + | x | ) | + | 9 | ( | 1 | + | 2 | x | ) |
| = | 8 | + | 8 | x | − | 4 | x | ( | 1 | + | x | ) | + | 9 | ( | 1 | + | 2 | x | ) |
| = | 8 | + | 8 | x | − | 4 | x | × | 1 | − | 4 | x | x | + | 9 | ( | 1 | + | 2 | x | ) |
| = | 8 | + | 8 | x | − | 4 | x | − | 4 | x | x | + | 9 | ( | 1 | + | 2 | x | ) |
| = | 8 | + | 4 | x | − | 4 | x | x | + | 9 | ( | 1 | + | 2 | x | ) |
| = | 8 | + | 4 | x | − | 4 | x | x | + | 9 | × | 1 | + | 9 | × | 2 | x |
| = | 8 | + | 4 | x | − | 4 | x | x | + | 9 | + | 18 | x |
| = | 17 | + | 22 | x | − | 4 | x | x |
| 17 | + | 22 | x | − | 4 | x | x | = | 18 | ( | 1 | + | 16 | ÷ | 15 | ) |
| 方程右边 = | 18 | × | 1 | + | 18 | × | 16 | ÷ | 15 |
| = | 18 | + | 96 5 |
| = | 186 5 |
| 17 | + | 22 | x | − | 4 | x | x | = | 186 5 |