21 20 | x | + | 4659 100 | + | 1 | + | 54 25 | + | ( | 21 20 | x | + | 4659 100 | + | 1 | + | 54 25 | ) | × | 3 20 | = | 366113638045893 1000000000000 |
| 方程左边 = | 21 20 | x | + | 199 4 | + | ( | 21 20 | x | + | 4659 100 | + | 1 | + | 54 25 | ) | × | 3 20 |
21 20 | x | + | 199 4 | + | ( | 21 20 | x | + | 4659 100 | + | 1 | + | 54 25 | ) | × | 3 20 | = | 366113638045893 1000000000000 |
| 方程左边 = | 21 20 | x | + | 199 4 | + | 21 20 | x | × | 3 20 | + | 4659 100 | × | 3 20 | + | 1 | × | 3 20 | + | 54 25 | × | 3 20 |
| = | 21 20 | x | + | 199 4 | + | 63 400 | x | + | 13977 2000 | + | 3 20 | + | 81 250 |
| = | 483 400 | x | + | 4577 80 |
483 400 | x | + | 4577 80 | = | 366113638045893 1000000000000 |
483 400 | x | = | 366113638045893 1000000000000 | − | 4577 80 |