| 1000 | × | 7 100 | × | 24 | + | ( | x | − | 1000 | ) | × | 9 100 | × | 24 | = | 1800 | + | ( | x | − | 800 | ) | × | 7 100 | × | 24 |
| 方程左边 = | 1680 | + | ( | x | − | 1000 | ) | × | 54 25 |
| 1680 | + | ( | x | − | 1000 | ) | × | 54 25 | = | 1800 | + | ( | x | − | 800 | ) | × | 7 100 | × | 24 |
| 方程左边 = | 1680 | + | x | × | 54 25 | − | 1000 | × | 54 25 |
| = | 1680 | + | x | × | 54 25 | − | 2160 |
| = | - | 480 | + | 54 25 | x |
| - | 480 | + | 54 25 | x | = | 1800 | + | ( | x | − | 800 | ) | × | 7 100 | × | 24 |
| 方程右边 = | 1800 | + | ( | x | − | 800 | ) | × | 42 25 |
| - | 480 | + | 54 25 | x | = | 1800 | + | ( | x | − | 800 | ) | × | 42 25 |
| 方程右边 = | 1800 | + | x | × | 42 25 | − | 800 | × | 42 25 |
| = | 1800 | + | x | × | 42 25 | − | 1344 |
| = | 456 | + | 42 25 | x |
| - | 480 | + | 54 25 | x | = | 456 | + | 42 25 | x |
54 25 | x | − | 42 25 | x | = | 456 | + | 480 |
12 25 | x | = | 456 | + | 480 |
12 25 | x | = | 936 |
| x | = | 936 | ÷ | 12 25 |
| = | 936 | × | 25 12 |
| = | 78 | × | 25 |
| x | = | 1950 |