41 20 | x | + | 49 25 | + | ( | 41 20 | x | + | 49 25 | ) | × | 3 20 | = | 130722142857143 100000000000 |
| 方程左边 = | 41 20 | x | + | 49 25 | + | 41 20 | x | × | 3 20 | + | 49 25 | × | 3 20 |
| = | 41 20 | x | + | 49 25 | + | 123 400 | x | + | 147 500 |
| = | 943 400 | x | + | 1127 500 |
943 400 | x | + | 1127 500 | = | 130722142857143 100000000000 |
943 400 | x | = | 130722142857143 100000000000 | − | 1127 500 |