| 1 | × | 1 | + | 2 | × | 0 | + | 3 | × | 2 | + | 4 | × | 1 | + | 5 | ( | 9 | + | X | ) | = | 43 10 | ( | 13 | + | X | ) |
| 方程左边 = | 1 | + | 0 | + | 6 | + | 4 | + | 5 | ( | 9 | + | X | ) |
| = | 11 | + | 5 | ( | 9 | + | X | ) |
| 11 | + | 5 | ( | 9 | + | X | ) | = | 43 10 | ( | 13 | + | X | ) |
| 方程左边 = | 11 | + | 5 | × | 9 | + | 5 | X |
| = | 11 | + | 45 | + | 5 | X |
| = | 56 | + | 5 | X |
| 56 | + | 5 | X | = | 43 10 | ( | 13 | + | X | ) |
| 方程右边 = | 43 10 | × | 13 | + | 43 10 | X |
| = | 559 10 | + | 43 10 | X |
| 56 | + | 5 | X | = | 559 10 | + | 43 10 | X |
| 5 | X | − | 43 10 | X | = | 559 10 | − | 56 |
7 10 | X | = | 559 10 | − | 56 |
7 10 | X | = | - | 1 10 |
| X | = | - | 1 10 | ÷ | 7 10 |
| = | - | 1 10 | × | 10 7 |
| = | - | 1 | × | 1 7 |
| X | = | - | 1 7 |
| X | = | - 0.142857 |