| ( | 30 | − | x | ) | × | 191 500 | + | x | = | 27 |
| 方程左边 = | 30 | × | 191 500 | − | x | × | 191 500 | + | x |
| = | 573 50 | − | x | × | 191 500 | + | x |
| = | 573 50 | + | 309 500 | x |
573 50 | + | 309 500 | x | = | 27 |
309 500 | x | = | 27 | − | 573 50 |
309 500 | x | = | 777 50 |
| x | = | 777 50 | ÷ | 309 500 |
| = | 777 50 | × | 500 309 |
| = | 259 | × | 10 103 |
| x | = | 2590 103 |
| x | = | 25.145631 |