309 500 | ( | 166 | + | x | ) | = | 99 | + | x |
| 方程左边 = | 309 500 | × | 166 | + | 309 500 | x |
| = | 25647 250 | + | 309 500 | x |
25647 250 | + | 309 500 | x | = | 99 | + | x |
309 500 | x | − | x | = | 99 | − | 25647 250 |
| - | 191 500 | x | = | 99 | − | 25647 250 |
| - | 191 500 | x | = | - | 897 250 |
897 250 | = | 191 500 | x |
191 500 | x | = | 897 250 |
| x | = | 897 250 | ÷ | 191 500 |
| = | 897 250 | × | 500 191 |
| = | 897 | × | 2 191 |
| x | = | 1794 191 |
| x | = | 9.39267 |