| ( | 108897 100 | − | a | ) | ÷ | a | = | 197 1000 |
| 方程两边同时乘以: | a |
| ( | 108897 100 | − | a | ) | = | 197 1000 | a |
108897 100 | − | a | = | 197 1000 | a |
| - | a | − | 197 1000 | a | = | - | 108897 100 |
| - | 1197 1000 | a | = | - | 108897 100 |
108897 100 | = | 1197 1000 | a |
1197 1000 | a | = | 108897 100 |
| a | = | 108897 100 | ÷ | 1197 1000 |
| = | 108897 100 | × | 1000 1197 |
| = | 36299 | × | 10 399 |
| a | = | 362990 399 |
| a | = | 909.749373 |