| X | × | 9 500 | + | ( | 1 | − | X | ) | × | 13 1000 | = | 2 125 |
| 方程左边 = | 9 500 | X | + | 1 | × | 13 1000 | − | X | × | 13 1000 |
| = | 9 500 | X | + | 13 1000 | − | X | × | 13 1000 |
| = | 1 200 | X | + | 13 1000 |
1 200 | X | + | 13 1000 | = | 2 125 |
1 200 | X | = | 2 125 | − | 13 1000 |
1 200 | X | = | 3 1000 |
| X | = | 3 1000 | ÷ | 1 200 |
| = | 3 1000 | × | 200 |
| = | 3 5 | × | 1 |
| X | = | 3 5 |
| X | = | 0.6 |