| ( | 21 | ÷ | 29 | ) | x | + | 7 10 | ( | 477 250 | − | x | ) | = | 861 625 |
| 方程左边 = | 21 | ÷ | 29 | × | x | + | 7 10 | ( | 477 250 | − | x | ) |
| = | 21 29 | x | + | 7 10 | ( | 477 250 | − | x | ) |
| = | 21 29 | x | + | 7 10 | × | 477 250 | − | 7 10 | x |
| = | 21 29 | x | + | 3339 2500 | − | 7 10 | x |
| = | 7 290 | x | + | 3339 2500 |
7 290 | x | + | 3339 2500 | = | 861 625 |
7 290 | x | = | 861 625 | − | 3339 2500 |
7 290 | x | = | 21 500 |
| x | = | 21 500 | ÷ | 7 290 |
| = | 21 500 | × | 290 7 |
| = | 3 50 | × | 29 |
| x | = | 87 50 |
| x | = | 1.74 |