| x | = | 6697912354851 50000000000 | + | x | ÷ | 21 20 | × | 5 100 |
| 方程右边 = | 6697912354851 50000000000 | + | x | × | 1 21 |
| x | = | 6697912354851 50000000000 | + | 1 21 | x |
| x | − | 1 21 | x | = | 6697912354851 50000000000 |
20 21 | x | = | 6697912354851 50000000000 |
| x | = | 6697912354851 50000000000 | ÷ | 20 21 |
| = | 6697912354851 50000000000 | × | 21 20 |
| x | = | 140656159451871 1000000000000 |