| 1200 | ÷ | x | − | 1200 | ÷ | ( | 3 2 | x | ) | = | 10 |
| 方程两边同时乘以: | x |
| 1200 | − | 1200 | ÷ | ( | 3 2 | × | 1 | ) | × | 1 | = | 10 | x |
| 方程两边同时乘以: | ( | 3 2 | × | 1 | ) |
| 1200 | ( | 3 2 | × | 1 | ) | − | 1200 | × | 1 | = | 10 | x | ( | 3 2 | × | 1 | ) |
| 1200 | × | 3 2 | × | 1 | − | 1200 | × | 1 | = | 10 | x | ( | 3 2 | × | 1 | ) |
| 1200 | × | 3 2 | × | 1 | − | 1200 | × | 1 | = | 10 | x | × | 3 2 | × | 1 |
| 1800 | − | 1200 | = | 15 | x |
| 600 | = | 15 | x |
| - | 15 | x | = | - | 600 |
| 600 | = | 15 | x |
| 15 | x | = | 600 |
| x | = | 600 | ÷ | 15 |
| = | 600 | × | 1 15 |
| = | 40 | × | 1 |
| x | = | 40 |