| 14 | × | 8 500 | + | 7 1000 | X | = | 7 2000 | X | + | 40 100 | × | 1 100 | X | − | 7 2000 | × | 10 |
| 方程左边 = | 28 125 | + | 7 1000 | X |
28 125 | + | 7 1000 | X | = | 7 2000 | X | + | 40 100 | × | 1 100 | X | − | 7 2000 | × | 10 |
| 方程右边 = | 7 2000 | X | + | 1 250 | X | − | 7 200 |
| = | 3 400 | X | − | 7 200 |
28 125 | + | 7 1000 | X | = | 3 400 | X | − | 7 200 |
7 1000 | X | − | 3 400 | X | = | - | 7 200 | − | 28 125 |
| - | 1 2000 | X | = | - | 7 200 | − | 28 125 |
| - | 1 2000 | X | = | - | 259 1000 |
259 1000 | = | 1 2000 | X |
1 2000 | X | = | 259 1000 |
| X | = | 259 1000 | ÷ | 1 2000 |
| = | 259 1000 | × | 2000 |
| = | 259 | × | 2 |
| X | = | 518 |