| 220 | X | + | ( | 130 | × | 7 10 | − | X | ) | × | 150 | + | 65 | × | 65 | + | 65 | × | 1 4 | × | 75 | = | 22696 |
| 方程左边 = | 220 | X | + | ( | 130 | × | 7 10 | − | X | ) | × | 150 | + | 4225 | + | 4875 4 |
| = | 220 | X | + | ( | 130 | × | 7 10 | − | X | ) | × | 150 | + | 21775 4 |
| 220 | X | + | ( | 130 | × | 7 10 | − | X | ) | × | 150 | + | 21775 4 | = | 22696 |
| 方程左边 = | 220 | X | + | 130 | × | 7 10 | × | 150 | − | X | × | 150 | + | 21775 4 |
| = | 220 | X | + | 13650 | − | X | × | 150 | + | 21775 4 |
| = | 70 | X | + | 76375 4 |
| 70 | X | + | 76375 4 | = | 22696 |
| 70 | X | = | 22696 | − | 76375 4 |
| 70 | X | = | 14409 4 |
| X | = | 14409 4 | ÷ | 70 |
| = | 14409 4 | × | 1 70 |
| X | = | 14409 280 |
| X | = | 51.460714 |