| ( | 183 | + | x | ) | ÷ | ( | 105 | + | x | ) | = | 309 500 |
| 方程两边同时乘以: | ( | 105 | + | x | ) |
| ( | 183 | + | x | ) | = | 309 500 | ( | 105 | + | x | ) |
| 183 | + | x | = | 309 500 | ( | 105 | + | x | ) |
| 183 | + | x | = | 309 500 | × | 105 | + | 309 500 | x |
| 183 | + | x | = | 6489 100 | + | 309 500 | x |
| x | − | 309 500 | x | = | 6489 100 | − | 183 |
191 500 | x | = | 6489 100 | − | 183 |
191 500 | x | = | - | 11811 100 |
| x | = | - | 11811 100 | ÷ | 191 500 |
| = | - | 11811 100 | × | 500 191 |
| = | - | 11811 | × | 5 191 |
| x | = | - | 59055 191 |
| x | = | - 309.188482 |