| 10 | + | 2400 | − | 10 | x | ÷ | x | + | 30 | = | 2400 | ÷ | x | − | 2 |
| 方程两边同时乘以: | x |
| 10 | x | + | 2400 | x | − | 10 | x | + | 30 | x | = | 2400 | ÷ | 1 | × | 1 | − | 2 | x |
| 10 | x | + | 2400 | x | − | 10 | x | + | 30 | x | + | 2 | x | = | 2400 | ÷ | 1 | × | 1 |
| 10 | x | + | 2400 | x | − | 10 | x | + | 30 | x | + | 2 | x | = | 2400 |
| 2432 | x | = | 2400 |
| x | = | 2400 | ÷ | 2432 |
| = | 2400 | × | 1 2432 |
| = | 75 | × | 1 76 |
| x | = | 75 76 |
| x | = | 0.986842 |