20 100 | = | 40 100 | − | ( | 1 | + | g | ) | ÷ | g | × | 7 100 |
| 方程两边同时乘以: | g |
20 100 | g | = | 40 100 | g | − | ( | 1 | + | g | ) | × | 7 100 |
20 100 | g | = | 40 100 | g | − | 1 | × | 7 100 | − | g | × | 7 100 |
20 100 | g | = | 40 100 | g | − | 7 100 | − | g | × | 7 100 |
20 100 | g | = | 33 100 | g | − | 7 100 |
20 100 | g | − | 33 100 | g | = | - | 7 100 |
| - | 13 100 | g | = | - | 7 100 |
7 100 | = | 13 100 | g |
13 100 | g | = | 7 100 |
| g | = | 7 100 | ÷ | 13 100 |
| = | 7 100 | × | 100 13 |
| = | 7 | × | 1 13 |
| g | = | 7 13 |
| g | = | 0.538462 |