| x | × | 2 | ÷ | 15 | + | ( | x | × | 2 | ÷ | 15 | + | 6 | ) | = | x | × | 3 | ÷ | 10 |
| 方程左边 = | x | × | 2 15 | + | ( | x | × | 2 | ÷ | 15 | + | 6 | ) |
2 15 | x | + | ( | x | × | 2 | ÷ | 15 | + | 6 | ) | = | x | × | 3 | ÷ | 10 |
| 方程左边 = | 2 15 | x | + | x | × | 2 | ÷ | 15 | + | 6 |
| = | 2 15 | x | + | x | × | 2 15 | + | 6 |
| = | 4 15 | x | + | 6 |
4 15 | x | + | 6 | = | x | × | 3 | ÷ | 10 |
| 方程右边 = | x | × | 3 10 |
4 15 | x | + | 6 | = | 3 10 | x |
4 15 | x | − | 3 10 | x | = | - | 6 |
| - | 1 30 | x | = | - | 6 |
| 6 | = | 1 30 | x |
1 30 | x | = | 6 |
| x | = | 6 | ÷ | 1 30 |
| = | 6 | × | 30 |
| x | = | 180 |