| 1 | ÷ | 5 | × | ( | x | + | 15 | ) | = | 1 | ÷ | 2 | − | 1 | ÷ | 3 | × | ( | x | − | 7 | ) |
| 方程左边 = | 1 5 | ( | x | + | 15 | ) |
1 5 | ( | x | + | 15 | ) | = | 1 | ÷ | 2 | − | 1 | ÷ | 3 | × | ( | x | − | 7 | ) |
| 方程左边 = | 1 5 | x | + | 1 5 | × | 15 |
| = | 1 5 | x | + | 3 |
1 5 | x | + | 3 | = | 1 | ÷ | 2 | − | 1 | ÷ | 3 | × | ( | x | − | 7 | ) |
| 方程右边 = | 1 2 | − | 1 3 | ( | x | − | 7 | ) |
1 5 | x | + | 3 | = | 1 2 | − | 1 3 | ( | x | − | 7 | ) |
| 方程右边 = | 1 2 | − | 1 3 | x | + | 1 3 | × | 7 |
| = | 1 2 | − | 1 3 | x | + | 7 3 |
| = | 17 6 | − | 1 3 | x |
1 5 | x | + | 3 | = | 17 6 | − | 1 3 | x |
1 5 | x | + | 1 3 | x | = | 17 6 | − | 3 |
8 15 | x | = | 17 6 | − | 3 |
8 15 | x | = | - | 1 6 |
| x | = | - | 1 6 | ÷ | 8 15 |
| = | - | 1 6 | × | 15 8 |
| = | - | 1 2 | × | 5 8 |
| x | = | - | 5 16 |
| x | = | - 0.3125 |