| 1800 | ÷ | ( | 3 2 | x | ) | = | 1500 | ÷ | x | − | 10 |
| 方程两边同时乘以: | ( | 3 2 | x | ) |
| 1800 | = | 1500 | ÷ | 1 | × | ( | 3 2 | × | 1 | ) | − | 10 | ( | 3 2 | x | ) |
| 1800 | = | 1500 | ÷ | 1 | × | 3 2 | × | 1 | − | 10 | ( | 3 2 | x | ) |
| 1800 | = | 2250 | − | 10 | ( | 3 2 | x | ) |
| 1800 | = | 2250 | − | 10 | × | 3 2 | x |
| 1800 | = | 2250 | − | 15 | x |
| 15 | x | = | 2250 | − | 1800 |
| 15 | x | = | 450 |
| x | = | 450 | ÷ | 15 |
| = | 450 | × | 1 15 |
| = | 30 | × | 1 |
| x | = | 30 |