| 3000 | g | ( | 120 100 | − | 30 100 | ) | − | 3000 | ( | 1 | + | g | ) | × | 5 100 | ( | 1 | − | 30 100 | ) | − | 200 | = | 0 |
| 方程左边 = | 3000 | g | ( | 120 100 | − | 30 100 | ) | − | 150 | ( | 1 | + | g | ) | ( | 1 | − | 30 100 | ) | − | 200 |
| 3000 | g | ( | 120 100 | − | 30 100 | ) | − | 150 | ( | 1 | + | g | ) | ( | 1 | − | 30 100 | ) | − | 200 | = | 0 |
| 方程左边 = | 3000 | g | × | 120 100 | − | 3000 | g | × | 30 100 | − | 150 | ( | 1 | + | g | ) | ( | 1 | − | 30 100 | ) | − | 200 |
| = | 3600 | g | − | 900 | g | − | 150 | ( | 1 | + | g | ) | ( | 1 | − | 30 100 | ) | − | 200 |
| = | 2700 | g | − | 150 | ( | 1 | + | g | ) | ( | 1 | − | 30 100 | ) | − | 200 |
| = | 2700 | g | − | 150 | × | 1 | ( | 1 | − | 30 100 | ) | − | 150 | g | ( | 1 | − | 30 100 | ) | − | 200 |
| = | 2700 | g | − | 150 | ( | 1 | − | 30 100 | ) | − | 150 | g | ( | 1 | − | 30 100 | ) | − | 200 |
| = | 2700 | g | − | 150 | × | 1 | + | 150 | × | 30 100 | − | 150 | g | ( | 1 | − | 30 100 | ) | − | 200 |
| = | 2700 | g | − | 150 | + | 45 | − | 150 | g | ( | 1 | − | 30 100 | ) | − | 200 |
| = | 2700 | g | − | 305 | − | 150 | g | ( | 1 | − | 30 100 | ) |
| = | 2700 | g | − | 305 | − | 150 | g | × | 1 | + | 150 | g | × | 30 100 |
| = | 2700 | g | − | 305 | − | 150 | g | + | 45 | g |
| = | 2595 | g | − | 305 |
| 2595 | g | − | 305 | = | 0 |
| 2595 | g | = | 0 | + | 305 |
| 2595 | g | = | 305 |
| g | = | 305 | ÷ | 2595 |
| = | 305 | × | 1 2595 |
| = | 61 | × | 1 519 |
| g | = | 61 519 |
| g | = | 0.117534 |