53 50 | x | + | 19 20 | ( | 11000 | − | x | ) | = | 11000 | × | 51 50 |
| 方程左边 = | 53 50 | x | + | 19 20 | × | 11000 | − | 19 20 | x |
| = | 53 50 | x | + | 10450 | − | 19 20 | x |
| = | 11 100 | x | + | 10450 |
11 100 | x | + | 10450 | = | 11000 | × | 51 50 |
| 方程右边 = | 11220 |
11 100 | x | + | 10450 | = | 11220 |
11 100 | x | = | 11220 | − | 10450 |
11 100 | x | = | 770 |
| x | = | 770 | ÷ | 11 100 |
| = | 770 | × | 100 11 |
| = | 70 | × | 100 |
| x | = | 7000 |