X | − | X | × | 13 20 | − | ( | X | + | 163972641 25 | ) | × | 3 10000 | = | 163972641 25 |
方程左边 = | 7 20 | X | − | ( | X | + | 163972641 25 | ) | × | 3 10000 |
7 20 | X | − | ( | X | + | 163972641 25 | ) | × | 3 10000 | = | 163972641 25 |
方程左边 = | 7 20 | X | − | X | × | 3 10000 | − | 163972641 25 | × | 3 10000 |
= | 7 20 | X | − | X | × | 3 10000 | − | 491917923 250000 |
= | 3497 10000 | X | − | 491917923 250000 |
3497 10000 | X | − | 491917923 250000 | = | 163972641 25 |
3497 10000 | X | = | 163972641 25 | + | 491917923 250000 |