| x | = | 17261925906379 125000000000 | + | x | ÷ | 21 20 | × | 5 100 |
| 方程右边 = | 17261925906379 125000000000 | + | x | × | 1 21 |
| x | = | 17261925906379 125000000000 | + | 1 21 | x |
| x | − | 1 21 | x | = | 17261925906379 125000000000 |
20 21 | x | = | 17261925906379 125000000000 |
| x | = | 17261925906379 125000000000 | ÷ | 20 21 |
| = | 17261925906379 125000000000 | × | 21 20 |
| x | = | 362500444033959 2500000000000 |