| ( | ( | 220 | + | 260 | + | 260 | ) | × | 28 | − | x | ) | × | 17 20 | + | ( | 32 | + | 32 | + | 18 | ) | × | 28 | = | 430892 25 |
| 方程左边 = | ( | 220 | + | 260 | + | 260 | ) | × | 28 | × | 17 20 | − | x | × | 17 20 | + | ( | 32 | + | 32 | + | 18 | ) | × | 28 |
| = | ( | 220 | + | 260 | + | 260 | ) | × | 119 5 | − | x | × | 17 20 | + | ( | 32 | + | 32 | + | 18 | ) | × | 28 |
| = | 220 | × | 119 5 | + | 260 | × | 119 5 | + | 260 | × | 119 5 | − | 17 20 | x | + | ( | 32 | + | 32 | + | 18 | ) | × | 28 |
| = | 5236 | + | 6188 | + | 6188 | − | 17 20 | x | + | ( | 32 | + | 32 | + | 18 | ) | × | 28 |
| = | 17612 | − | 17 20 | x | + | ( | 32 | + | 32 | + | 18 | ) | × | 28 |
| = | 17612 | − | 17 20 | x | + | 32 | × | 28 | + | 32 | × | 28 | + | 18 | × | 28 |
| = | 17612 | − | 17 20 | x | + | 896 | + | 896 | + | 504 |
| = | 19908 | − | 17 20 | x |
| 19908 | − | 17 20 | x | = | 430892 25 |
| - | 17 20 | x | = | 430892 25 | − | 19908 |
| - | 17 20 | x | = | - | 66808 25 |
66808 25 | = | 17 20 | x |
17 20 | x | = | 66808 25 |
| x | = | 66808 25 | ÷ | 17 20 |
| = | 66808 25 | × | 20 17 |
| = | 66808 5 | × | 4 17 |
| x | = | 267232 85 |
| x | = | 3143.905882 |