| X | × | 1 | + | X | × | 2 | + | 2 | X | × | 3 | − | X | × | 4 | = | 0 |
| 方程左边 = | X | × | 1 | + | X | × | 2 | + | 6 | X | − | X | × | 4 |
| = | 5 | X |
| 5 | X | = | 0 |
| X | = | 0 | ÷ | 5 |
| = | 0 | × | 1 5 |
| X | = | 0 |
| 2 | X | × | 1 | + | X | × | 2 | + | X | × | 3 | − | X | × | 4 | = | 0 |
| 方程左边 = | 2 | X | + | X | × | 2 | + | X | × | 3 | − | X | × | 4 |
| = | 3 | X |
| 3 | X | = | 0 |
| X | = | 0 | ÷ | 3 |
| = | 0 | × | 1 3 |
| X | = | 0 |
| 2 | X | × | 1 | + | 2 | X | × | 2 | + | X | × | 3 | + | 2 | X | × | 4 | = | 0 |
| 方程左边 = | 2 | X | + | 4 | X | + | X | × | 3 | + | 8 | X |
| = | 17 | X |
| 17 | X | = | 0 |
| X | = | 0 | ÷ | 17 |
| = | 0 | × | 1 17 |
| X | = | 0 |