| ( | a | − | 5000 | ) | × | 3 100 | + | 14000 | = | a |
| 方程左边 = | a | × | 3 100 | − | 5000 | × | 3 100 | + | 14000 |
| = | a | × | 3 100 | − | 150 | + | 14000 |
| = | 3 100 | a | + | 13850 |
3 100 | a | + | 13850 | = | a |
3 100 | a | − | a | = | - | 13850 |
| - | 97 100 | a | = | - | 13850 |
| 13850 | = | 97 100 | a |
97 100 | a | = | 13850 |
| a | = | 13850 | ÷ | 97 100 |
| = | 13850 | × | 100 97 |
| a | = | 1385000 97 |
| a | = | 14278.350515 |