| 14 | × | 8 500 | + | 7 1000 | X | + | 7 2000 | × | 1 | = | 7 2000 | X | + | 40 100 | × | 1 100 | X |
| 方程左边 = | 28 125 | + | 7 1000 | X | + | 7 2000 |
| = | 91 400 | + | 7 1000 | X |
91 400 | + | 7 1000 | X | = | 7 2000 | X | + | 40 100 | × | 1 100 | X |
| 方程右边 = | 7 2000 | X | + | 1 250 | X |
| = | 3 400 | X |
91 400 | + | 7 1000 | X | = | 3 400 | X |
7 1000 | X | − | 3 400 | X | = | - | 91 400 |
| - | 1 2000 | X | = | - | 91 400 |
91 400 | = | 1 2000 | X |
1 2000 | X | = | 91 400 |
| X | = | 91 400 | ÷ | 1 2000 |
| = | 91 400 | × | 2000 |
| = | 91 | × | 5 |
| X | = | 455 |