X | + | 15 2 | = | 4 5 | ( | X | − | 15 2 | + | X | ) |
方程右边 = | 4 5 | X | − | 4 5 | × | 15 2 | + | 4 5 | X |
= | 4 5 | X | − | 6 | + | 4 5 | X |
= | 8 5 | X | − | 6 |
X | + | 15 2 | = | 8 5 | X | − | 6 |
X | − | 8 5 | X | = | - | 6 | − | 15 2 |
- | 3 5 | X | = | - | 6 | − | 15 2 |
- | 3 5 | X | = | - | 27 2 |
27 2 | = | 3 5 | X |
3 5 | X | = | 27 2 |
X | = | 27 2 | ÷ | 3 5 |
= | 27 2 | × | 5 3 |
= | 9 2 | × | 5 |
X | = | 45 2 |
X | = | 22.5 |