| 1455 | x | + | 2215 4 | ( | 1 | − | x | ) | = | 1645 |
| 方程左边 = | 1455 | x | + | 2215 4 | × | 1 | − | 2215 4 | x |
| = | 1455 | x | + | 2215 4 | − | 2215 4 | x |
| = | 3605 4 | x | + | 2215 4 |
3605 4 | x | + | 2215 4 | = | 1645 |
3605 4 | x | = | 1645 | − | 2215 4 |
3605 4 | x | = | 4365 4 |
| x | = | 4365 4 | ÷ | 3605 4 |
| = | 4365 4 | × | 4 3605 |
| = | 873 | × | 1 721 |
| x | = | 873 721 |
| x | = | 1.210818 |