| 3 | ( | x | − | 1 | ) | + | 5 | ( | x | + | 3 | ) | = | 8 | ( | 3 | − | x | ) | + | 5 |
| 方程左边 = | 3 | x | − | 3 | × | 1 | + | 5 | ( | x | + | 3 | ) |
| = | 3 | x | − | 3 | + | 5 | ( | x | + | 3 | ) |
| = | 3 | x | − | 3 | + | 5 | x | + | 5 | × | 3 |
| = | 3 | x | − | 3 | + | 5 | x | + | 15 |
| = | 8 | x | + | 12 |
| 8 | x | + | 12 | = | 8 | ( | 3 | − | x | ) | + | 5 |
| 方程右边 = | 8 | × | 3 | − | 8 | x | + | 5 |
| = | 24 | − | 8 | x | + | 5 |
| = | 29 | − | 8 | x |
| 8 | x | + | 12 | = | 29 | − | 8 | x |
| 8 | x | + | 8 | x | = | 29 | − | 12 |
| 16 | x | = | 29 | − | 12 |
| 16 | x | = | 17 |
| x | = | 17 | ÷ | 16 |
| = | 17 | × | 1 16 |
| x | = | 17 16 |
| x | = | 1.0625 |