| X | ( | 1 | − | 1 5 | ) | + | 63 | = | X | ( | 1 | + | 1 5 | ) |
| 方程左边 = | X | × | 1 | − | X | × | 1 5 | + | 63 |
| = | 4 5 | X | + | 63 |
4 5 | X | + | 63 | = | X | ( | 1 | + | 1 5 | ) |
| 方程右边 = | X | × | 1 | + | X | × | 1 5 |
| = | 6 5 | X |
4 5 | X | + | 63 | = | 6 5 | X |
4 5 | X | − | 6 5 | X | = | - | 63 |
| - | 2 5 | X | = | - | 63 |
| 63 | = | 2 5 | X |
2 5 | X | = | 63 |
| X | = | 63 | ÷ | 2 5 |
| = | 63 | × | 5 2 |
| X | = | 315 2 |
| X | = | 157.5 |