| 4 | ( | 4 5 | + | 3 10000 | ( | 1500 | + | X | ) | ) | ( | 1500 | − | X | ) | = | ( | 3 5 | + | 3 10000 | ( | X | + | 100 | ) | ) | ( | X | − | 100 | ) |
| 方程左边 = | 4 | × | 4 5 | ( | 1500 | − | X | ) | + | 4 | × | 3 10000 | ( | 1500 | + | X | ) | ( | 1500 | − | X | ) |
| = | 16 5 | ( | 1500 | − | X | ) | + | 3 2500 | ( | 1500 | + | X | ) | ( | 1500 | − | X | ) |
| = | 16 5 | × | 1500 | − | 16 5 | X | + | 3 2500 | ( | 1500 | + | X | ) | ( | 1500 | − | X | ) |
| = | 4800 | − | 16 5 | X | + | 3 2500 | ( | 1500 | + | X | ) | ( | 1500 | − | X | ) |
| = | 4800 | − | 16 5 | X | + | 3 2500 | × | 1500 | ( | 1500 | − | X | ) | + | 3 2500 | X | ( | 1500 | − | X | ) |
| = | 4800 | − | 16 5 | X | + | 9 5 | ( | 1500 | − | X | ) | + | 3 2500 | X | ( | 1500 | − | X | ) |
| = | 4800 | − | 16 5 | X | + | 9 5 | × | 1500 | − | 9 5 | X | + | 3 2500 | X | ( | 1500 | − | X | ) |
| = | 4800 | − | 16 5 | X | + | 2700 | − | 9 5 | X | + | 3 2500 | X | ( | 1500 | − | X | ) |
| = | 7500 | − | 5 | X | + | 3 2500 | X | ( | 1500 | − | X | ) |
| = | 7500 | − | 5 | X | + | 3 2500 | X | × | 1500 | − | 3 2500 | X | X |
| = | 7500 | − | 5 | X | + | 9 5 | X | − | 3 2500 | X | X |
| = | 7500 | − | 16 5 | X | − | 3 2500 | X | X |
| 7500 | − | 16 5 | X | − | 3 2500 | X | X | = | ( | 3 5 | + | 3 10000 | ( | X | + | 100 | ) | ) | ( | X | − | 100 | ) |
| 方程右边 = | 3 5 | ( | X | − | 100 | ) | + | 3 10000 | ( | X | + | 100 | ) | ( | X | − | 100 | ) |
| = | 3 5 | X | − | 3 5 | × | 100 | + | 3 10000 | ( | X | + | 100 | ) | ( | X | − | 100 | ) |
| = | 3 5 | X | − | 60 | + | 3 10000 | ( | X | + | 100 | ) | ( | X | − | 100 | ) |
| = | 3 5 | X | − | 60 | + | 3 10000 | X | ( | X | − | 100 | ) | + | 3 10000 | × | 100 | ( | X | − | 100 | ) |
| = | 3 5 | X | − | 60 | + | 3 10000 | X | ( | X | − | 100 | ) | + | 3 100 | ( | X | − | 100 | ) |
| = | 3 5 | X | − | 60 | + | 3 10000 | X | X | − | 3 10000 | X | × | 100 | + | 3 100 | ( | X | − | 100 | ) |
| = | 3 5 | X | − | 60 | + | 3 10000 | X | X | − | 3 100 | X | + | 3 100 | ( | X | − | 100 | ) |
| = | 57 100 | X | − | 60 | + | 3 10000 | X | X | + | 3 100 | ( | X | − | 100 | ) |
| = | 57 100 | X | − | 60 | + | 3 10000 | X | X | + | 3 100 | X | − | 3 100 | × | 100 |
| = | 57 100 | X | − | 60 | + | 3 10000 | X | X | + | 3 100 | X | − | 3 |
| = | 3 5 | X | − | 63 | + | 3 10000 | X | X |
| 7500 | − | 16 5 | X | − | 3 2500 | X | X | = | 3 5 | X | − | 63 | + | 3 10000 | X | X |
| 7500 | − | 16 5 | X | − | 3 2500 | X | X | = | 3 5 | X | − | 63 | + | 3 10000 | X | X |