| 16 | a | ÷ | ( | 2000 | + | a | ) | = | 172789 50000 |
| 方程两边同时乘以: | ( | 2000 | + | a | ) |
| 16 | a | = | 172789 50000 | ( | 2000 | + | a | ) |
| 16 | a | = | 172789 50000 | × | 2000 | + | 172789 50000 | a |
| 16 | a | = | 172789 25 | + | 172789 50000 | a |
| 16 | a | − | 172789 50000 | a | = | 172789 25 |
627211 50000 | a | = | 172789 25 |
| a | = | 172789 25 | ÷ | 627211 50000 |
| = | 172789 25 | × | 50000 627211 |
| = | 172789 | × | 2000 627211 |
| a | = | 345578000 627211 |
| a | = | 550.975668 |