2197 1000 | ( | 1 | + | X | ) | = | 169 100 | ( | 13 10 | + | X | ) |
| 方程左边 = | 2197 1000 | × | 1 | + | 2197 1000 | X |
| = | 2197 1000 | + | 2197 1000 | X |
2197 1000 | + | 2197 1000 | X | = | 169 100 | ( | 13 10 | + | X | ) |
| 方程右边 = | 169 100 | × | 13 10 | + | 169 100 | X |
| = | 2197 1000 | + | 169 100 | X |
2197 1000 | + | 2197 1000 | X | = | 2197 1000 | + | 169 100 | X |
2197 1000 | X | − | 169 100 | X | = | 2197 1000 | − | 2197 1000 |
507 1000 | X | = | 2197 1000 | − | 2197 1000 |
507 1000 | X | = | 0 |
| X | = | 0 | ÷ | 507 1000 |
| = | 0 | × | 1000 507 |
| = | 0 | × | 1 507 |
| X | = | 0 |