16 100 | w | + | 28 500 | ( | 1 | − | w | ) | = | 12 100 |
| 方程左边 = | 16 100 | w | + | 28 500 | × | 1 | − | 28 500 | w |
| = | 16 100 | w | + | 7 125 | − | 28 500 | w |
| = | 13 125 | w | + | 7 125 |
13 125 | w | + | 7 125 | = | 12 100 |
13 125 | w | = | 12 100 | − | 7 125 |
13 125 | w | = | 8 125 |
| w | = | 8 125 | ÷ | 13 125 |
| = | 8 125 | × | 125 13 |
| = | 8 | × | 1 13 |
| w | = | 8 13 |
| w | = | 0.615385 |