| ( | ( | 220 | + | 260 | ) | × | 28 | − | x | ) | × | 9 10 | + | 18 | × | 28 | = | 264684 25 |
| 方程左边 = | ( | ( | 220 | + | 260 | ) | × | 28 | − | x | ) | × | 9 10 | + | 504 |
| ( | ( | 220 | + | 260 | ) | × | 28 | − | x | ) | × | 9 10 | + | 504 | = | 264684 25 |
| 方程左边 = | ( | 220 | + | 260 | ) | × | 28 | × | 9 10 | − | x | × | 9 10 | + | 504 |
| = | ( | 220 | + | 260 | ) | × | 126 5 | − | x | × | 9 10 | + | 504 |
| = | 220 | × | 126 5 | + | 260 | × | 126 5 | − | 9 10 | x | + | 504 |
| = | 5544 | + | 6552 | − | 9 10 | x | + | 504 |
| = | 12600 | − | 9 10 | x |
| 12600 | − | 9 10 | x | = | 264684 25 |
| - | 9 10 | x | = | 264684 25 | − | 12600 |
| - | 9 10 | x | = | - | 50316 25 |
50316 25 | = | 9 10 | x |
9 10 | x | = | 50316 25 |
| x | = | 50316 25 | ÷ | 9 10 |
| = | 50316 25 | × | 10 9 |
| = | 16772 5 | × | 2 3 |
| x | = | 33544 15 |
| x | = | 2236.266667 |