| 1677 | × | 3 50 | + | ( | X | − | 1677 | ) | × | 1 25 | = | X | × | 1 25 |
| 方程左边 = | 5031 50 | + | ( | X | − | 1677 | ) | × | 1 25 |
5031 50 | + | ( | X | − | 1677 | ) | × | 1 25 | = | X | × | 1 25 |
| 方程左边 = | 5031 50 | + | X | × | 1 25 | − | 1677 | × | 1 25 |
| = | 5031 50 | + | X | × | 1 25 | − | 1677 25 |
| = | 1677 50 | + | 1 25 | X |
1677 50 | + | 1 25 | X | = | X | × | 1 25 |
1 25 | X | − | 1 25 | X | = | - | 1677 50 |
| 0 | X | = | - | 1677 50 |