139 50 | x | ÷ | ( | x | + | 1400 | ) | = | 230 |
| 方程两边同时乘以: | ( | x | + | 1400 | ) |
139 50 | x | = | 230 | ( | x | + | 1400 | ) |
139 50 | x | = | 230 | x | + | 230 | × | 1400 |
139 50 | x | = | 230 | x | + | 322000 |
139 50 | x | − | 230 | x | = | 322000 |
| - | 11361 50 | x | = | 322000 |
| - | 322000 | = | 11361 50 | x |
11361 50 | x | = | - | 322000 |
| x | = | - | 322000 | ÷ | 11361 50 |
| = | - | 322000 | × | 50 11361 |
| = | - | 46000 | × | 50 1623 |
| x | = | - | 2300000 1623 |
| x | = | - 1417.128774 |