| 5 | + | ( | x | × | 21 20 | + | 5 | ) | + | 3 20 | x | + | ( | 1 10 | x | × | 833 5000 | ) | = | 2719 25 |
| 方程左边 = | 5 | + | x | × | 21 20 | + | 5 | + | 3 20 | x | + | ( | 1 10 | x | × | 833 5000 | ) |
| = | 10 | + | 6 5 | x | + | ( | 1 10 | x | × | 833 5000 | ) |
| = | 10 | + | 6 5 | x | + | 1 10 | x | × | 833 5000 |
| = | 10 | + | 6 5 | x | + | 833 50000 | x |
| = | 10 | + | 60833 50000 | x |
| 10 | + | 60833 50000 | x | = | 2719 25 |
60833 50000 | x | = | 2719 25 | − | 10 |
60833 50000 | x | = | 2469 25 |
| x | = | 2469 25 | ÷ | 60833 50000 |
| = | 2469 25 | × | 50000 60833 |
| = | 2469 | × | 2000 60833 |
| x | = | 4938000 60833 |
| x | = | 81.173048 |