| 0 | = | 60 100 | − | 15 100 | − | ( | ( | 1 | + | g | ) | ÷ | g | ) | × | 5 100 |
| 0 | = | 60 100 | − | 15 100 | − | ( | 1 | + | g | ) | ÷ | g | × | 5 100 |
| 0 | = | 9 20 | − | ( | 1 | + | g | ) | ÷ | g | × | 5 100 |
| 方程两边同时乘以: | g |
| 0 | = | 9 20 | g | − | ( | 1 | + | g | ) | × | 5 100 |
| 0 | = | 9 20 | g | − | 1 | × | 5 100 | − | g | × | 5 100 |
| 0 | = | 9 20 | g | − | 1 20 | − | g | × | 5 100 |
| 0 | = | 2 5 | g | − | 1 20 |
| - | 2 5 | g | = | - | 1 20 | − | 0 |
| - | 2 5 | g | = | - | 1 20 |
1 20 | = | 2 5 | g |
2 5 | g | = | 1 20 |
| g | = | 1 20 | ÷ | 2 5 |
| = | 1 20 | × | 5 2 |
| = | 1 4 | × | 1 2 |
| g | = | 1 8 |
| g | = | 0.125 |