| 300 | X | − | 2800000 | × | 160 | X | = | 1000000 |
| 方程左边 = | 300 | X | − | 448000000 | X |
| = | - | 447999700 | X |
| - | 447999700 | X | = | 1000000 |
| - | 1000000 | = | 447999700 | X |
| 447999700 | X | = | - | 1000000 |
| X | = | - | 1000000 | ÷ | 447999700 |
| = | - | 1000000 | × | 1 447999700 |
| = | - | 10000 | × | 1 4479997 |
| X | = | - | 10000 4479997 |
| X | = | - 0.002232 |