| 200 | ( | 200 | × | 500 | + | 200 | x | + | 500 | x | ) | = | 10000 | x |
| 方程左边 = | 200 | × | 200 | × | 500 | + | 200 | × | 200 | x | + | 200 | × | 500 | x |
| = | 20000000 | + | 40000 | x | + | 100000 | x |
| = | 20000000 | + | 140000 | x |
| 20000000 | + | 140000 | x | = | 10000 | x |
| 140000 | x | − | 10000 | x | = | - | 20000000 |
| 130000 | x | = | - | 20000000 |
| x | = | - | 20000000 | ÷ | 130000 |
| = | - | 20000000 | × | 1 130000 |
| = | - | 2000 | × | 1 13 |
| x | = | - | 2000 13 |
| x | = | - 153.846154 |