| ( | x | − | 10 | ) | × | 9 500 | + | 10 | × | 3 1000 | = | ( | x | − | 50 | ) | × | 19 1000 | + | 50 | × | 3 1000 |
| 方程左边 = | ( | x | − | 10 | ) | × | 9 500 | + | 3 100 |
| ( | x | − | 10 | ) | × | 9 500 | + | 3 100 | = | ( | x | − | 50 | ) | × | 19 1000 | + | 50 | × | 3 1000 |
| 方程左边 = | x | × | 9 500 | − | 10 | × | 9 500 | + | 3 100 |
| = | x | × | 9 500 | − | 9 50 | + | 3 100 |
| = | 9 500 | x | − | 3 20 |
9 500 | x | − | 3 20 | = | ( | x | − | 50 | ) | × | 19 1000 | + | 50 | × | 3 1000 |
| 方程右边 = | ( | x | − | 50 | ) | × | 19 1000 | + | 3 20 |
9 500 | x | − | 3 20 | = | ( | x | − | 50 | ) | × | 19 1000 | + | 3 20 |
| 方程右边 = | x | × | 19 1000 | − | 50 | × | 19 1000 | + | 3 20 |
| = | x | × | 19 1000 | − | 19 20 | + | 3 20 |
| = | 19 1000 | x | − | 4 5 |
9 500 | x | − | 3 20 | = | 19 1000 | x | − | 4 5 |
9 500 | x | − | 19 1000 | x | = | - | 4 5 | + | 3 20 |
| - | 1 1000 | x | = | - | 4 5 | + | 3 20 |
| - | 1 1000 | x | = | - | 13 20 |
13 20 | = | 1 1000 | x |
1 1000 | x | = | 13 20 |
| x | = | 13 20 | ÷ | 1 1000 |
| = | 13 20 | × | 1000 |
| = | 13 | × | 50 |
| x | = | 650 |