( | X | − | 10 | ) | ( | 600 | + | 200 | X | ) | = | 8400 |
方程左边 = | X | ( | 600 | + | 200 | X | ) | − | 10 | ( | 600 | + | 200 | X | ) |
= | X | × | 600 | + | X | × | 200 | X | − | 10 | ( | 600 | + | 200 | X | ) |
= | 600 | X | + | X | × | 200 | X | − | 10 | × | 600 | − | 10 | × | 200 | X |
= | 600 | X | + | X | × | 200 | X | − | 6000 | − | 2000 | X |
= | - | 1400 | X | + | X | × | 200 | X | − | 6000 |
- | 1400 | X | + | X | × | 200 | X | − | 6000 | = | 8400 |