| ( | 3 | ÷ | 8 | + | x | ) | × | 8 | ÷ | 15 | = | 5 | ÷ | 9 |
| 方程左边 = | ( | 3 | ÷ | 8 | + | x | ) | × | 8 15 |
| ( | 3 | ÷ | 8 | + | x | ) | × | 8 15 | = | 5 | ÷ | 9 |
| 方程左边 = | 3 | ÷ | 8 | × | 8 15 | + | x | × | 8 15 |
| = | 1 5 | + | x | × | 8 15 |
1 5 | + | 8 15 | x | = | 5 | ÷ | 9 |
| 方程右边 = | 5 9 |
1 5 | + | 8 15 | x | = | 5 9 |
8 15 | x | = | 5 9 | − | 1 5 |
8 15 | x | = | 16 45 |
| x | = | 16 45 | ÷ | 8 15 |
| = | 16 45 | × | 15 8 |
| = | 2 3 | × | 1 |
| x | = | 2 3 |
| x | = | 0.666667 |