| 220 | x | ÷ | ( | 220 | + | x | ) | = | 2420 | ÷ | 33 |
| 方程两边同时乘以: | ( | 220 | + | x | ) |
| 220 | x | = | 2420 | ÷ | 33 | × | ( | 220 | + | x | ) |
| 220 | x | = | 2420 | ÷ | 33 | × | 220 | + | 2420 | ÷ | 33 | × | x |
| 220 | x | = | 48400 3 | + | 220 3 | x |
| 220 | x | − | 220 3 | x | = | 48400 3 |
440 3 | x | = | 48400 3 |
| x | = | 48400 3 | ÷ | 440 3 |
| = | 48400 3 | × | 3 440 |
| = | 110 | × | 1 |
| x | = | 110 |