| x | ( | 1 | + | 1 10 | ) | ( | 1 | + | 168 2500 | ) | = | 91000 |
| 方程左边 = | x | × | 1 | ( | 1 | + | 168 2500 | ) | + | x | × | 1 10 | ( | 1 | + | 168 2500 | ) |
| = | x | × | 1 | × | 1 | + | x | × | 1 | × | 168 2500 | + | x | × | 1 10 | ( | 1 | + | 168 2500 | ) |
| = | x | × | 1 | + | x | × | 42 625 | + | x | × | 1 10 | ( | 1 | + | 168 2500 | ) |
| = | 667 625 | x | + | x | × | 1 10 | ( | 1 | + | 168 2500 | ) |
| = | 667 625 | x | + | x | × | 1 10 | × | 1 | + | x | × | 1 10 | × | 168 2500 |
| = | 667 625 | x | + | x | × | 1 10 | + | x | × | 21 3125 |
| = | 7337 6250 | x |
7337 6250 | x | = | 91000 |
| x | = | 91000 | ÷ | 7337 6250 |
| = | 91000 | × | 6250 7337 |
| x | = | 568750000 7337 |
| x | = | 77518.059152 |