| 3 | x | ÷ | 8 | + | 15 | = | 3 | ÷ | 7 | × | ( | 14 | − | x | ) |
| 方程左边 = | 3 8 | x | + | 15 |
3 8 | x | + | 15 | = | 3 | ÷ | 7 | × | ( | 14 | − | x | ) |
| 方程右边 = | 3 7 | ( | 14 | − | x | ) |
3 8 | x | + | 15 | = | 3 7 | ( | 14 | − | x | ) |
| 方程右边 = | 3 7 | × | 14 | − | 3 7 | x |
| = | 6 | − | 3 7 | x |
3 8 | x | + | 15 | = | 6 | − | 3 7 | x |
3 8 | x | + | 3 7 | x | = | 6 | − | 15 |
45 56 | x | = | 6 | − | 15 |
45 56 | x | = | - | 9 |
| x | = | - | 9 | ÷ | 45 56 |
| = | - | 9 | × | 56 45 |
| = | - | 1 | × | 56 5 |
| x | = | - | 56 5 |
| x | = | - 11.2 |