8 5 | ( | x | + | 3 | ) | ÷ | 3 | = | 8 5 | ( | x | + | 7 | ) | ÷ | 4 |
| 方程左边 = | 8 15 | ( | x | + | 3 | ) |
8 15 | ( | x | + | 3 | ) | = | 8 5 | ( | x | + | 7 | ) | ÷ | 4 |
| 方程左边 = | 8 15 | x | + | 8 15 | × | 3 |
| = | 8 15 | x | + | 8 5 |
8 15 | x | + | 8 5 | = | 8 5 | ( | x | + | 7 | ) | ÷ | 4 |
| 方程右边 = | 2 5 | ( | x | + | 7 | ) |
8 15 | x | + | 8 5 | = | 2 5 | ( | x | + | 7 | ) |
| 方程右边 = | 2 5 | x | + | 2 5 | × | 7 |
| = | 2 5 | x | + | 14 5 |
8 15 | x | + | 8 5 | = | 2 5 | x | + | 14 5 |
8 15 | x | − | 2 5 | x | = | 14 5 | − | 8 5 |
2 15 | x | = | 14 5 | − | 8 5 |
2 15 | x | = | 6 5 |
| x | = | 6 5 | ÷ | 2 15 |
| = | 6 5 | × | 15 2 |
| = | 3 | × | 3 |
| x | = | 9 |