| x | + | ( | 50000 | − | 21 | x | ) | × | 3 5 | ÷ | 65 2 | = | 1000 |
| 方程左边 = | x | + | ( | 50000 | − | 21 | x | ) | × | 6 325 |
| x | + | ( | 50000 | − | 21 | x | ) | × | 6 325 | = | 1000 |
| 方程左边 = | x | + | 50000 | × | 6 325 | − | 21 | x | × | 6 325 |
| = | x | + | 12000 13 | − | 126 325 | x |
| = | 199 325 | x | + | 12000 13 |
199 325 | x | + | 12000 13 | = | 1000 |
199 325 | x | = | 1000 | − | 12000 13 |
199 325 | x | = | 1000 13 |
| x | = | 1000 13 | ÷ | 199 325 |
| = | 1000 13 | × | 325 199 |
| = | 1000 | × | 25 199 |
| x | = | 25000 199 |
| x | = | 125.628141 |