| ( | ( | x | − | 600 | ) | × | 75 100 | ) | ÷ | 8000 | = | ( | ( | x | − | 850 | ) | × | 75 100 | ) | ÷ | 7000 |
| 方程左边 = | ( | x | − | 600 | ) | × | 75 100 | × | 1 8000 |
| = | ( | x | − | 600 | ) | × | 3 32000 |
| = | x | × | 3 32000 | − | 600 | × | 3 32000 |
| = | x | × | 3 32000 | − | 9 160 |
3 32000 | x | − | 9 160 | = | ( | ( | x | − | 850 | ) | × | 75 100 | ) | ÷ | 7000 |
| 方程右边 = | ( | x | − | 850 | ) | × | 75 100 | × | 1 7000 |
| = | ( | x | − | 850 | ) | × | 3 28000 |
| = | x | × | 3 28000 | − | 850 | × | 3 28000 |
| = | x | × | 3 28000 | − | 51 560 |
3 32000 | x | − | 9 160 | = | 3 28000 | x | − | 51 560 |
3 32000 | x | − | 3 28000 | x | = | - | 51 560 | + | 9 160 |
| - | 3 224000 | x | = | - | 51 560 | + | 9 160 |
| - | 3 224000 | x | = | - | 39 1120 |
39 1120 | = | 3 224000 | x |
3 224000 | x | = | 39 1120 |
| x | = | 39 1120 | ÷ | 3 224000 |
| = | 39 1120 | × | 224000 3 |
| = | 13 | × | 200 |
| x | = | 2600 |