| ( | 1275 | x | ÷ | 11 | ) | + | 3 | = | ( | 20 | + | x | ) | × | 8400 | ÷ | 43 |
| 方程左边 = | 1275 | x | ÷ | 11 | + | 3 |
| = | 1275 11 | x | + | 3 |
1275 11 | x | + | 3 | = | ( | 20 | + | x | ) | × | 8400 | ÷ | 43 |
| 方程右边 = | ( | 20 | + | x | ) | × | 8400 43 |
1275 11 | x | + | 3 | = | ( | 20 | + | x | ) | × | 8400 43 |
| 方程右边 = | 20 | × | 8400 43 | + | x | × | 8400 43 |
| = | 168000 43 | + | x | × | 8400 43 |
1275 11 | x | + | 3 | = | 168000 43 | + | 8400 43 | x |
1275 11 | x | − | 8400 43 | x | = | 168000 43 | − | 3 |
| - | 37575 473 | x | = | 168000 43 | − | 3 |
| - | 37575 473 | x | = | 167871 43 |
| - | 167871 43 | = | 37575 473 | x |
37575 473 | x | = | - | 167871 43 |
| x | = | - | 167871 43 | ÷ | 37575 473 |
| = | - | 167871 43 | × | 473 37575 |
| = | - | 55957 | × | 11 12525 |
| x | = | - | 615527 12525 |
| x | = | - 49.143872 |