| ( | 360 | + | x | ) | ÷ | 30 | = | ( | 240 | + | x | ) | ÷ | 24 |
| 方程左边 = | 360 | × | 1 30 | + | x | × | 1 30 |
| = | 12 | + | x | × | 1 30 |
| 12 | + | 1 30 | x | = | ( | 240 | + | x | ) | ÷ | 24 |
| 方程右边 = | 240 | × | 1 24 | + | x | × | 1 24 |
| = | 10 | + | x | × | 1 24 |
| 12 | + | 1 30 | x | = | 10 | + | 1 24 | x |
1 30 | x | − | 1 24 | x | = | 10 | − | 12 |
| - | 1 120 | x | = | 10 | − | 12 |
| - | 1 120 | x | = | - | 2 |
| 2 | = | 1 120 | x |
1 120 | x | = | 2 |
| x | = | 2 | ÷ | 1 120 |
| = | 2 | × | 120 |
| x | = | 240 |