| ( | ( | 353866 5 | + | a | + | 10000 | ) | − | 40000 | ) | × | 3 100 | = | 5366 5 | + | a |
| 方程左边 = | ( | 353866 5 | + | a | + | 10000 | ) | × | 3 100 | − | 40000 | × | 3 100 |
| = | ( | 353866 5 | + | a | + | 10000 | ) | × | 3 100 | − | 1200 |
| = | 353866 5 | × | 3 100 | + | a | × | 3 100 | + | 10000 | × | 3 100 | − | 1200 |
| = | 530799 250 | + | a | × | 3 100 | + | 300 | − | 1200 |
| = | 305799 250 | + | 3 100 | a |
305799 250 | + | 3 100 | a | = | 5366 5 | + | a |
3 100 | a | − | a | = | 5366 5 | − | 305799 250 |
| - | 97 100 | a | = | 5366 5 | − | 305799 250 |
| - | 97 100 | a | = | - | 37499 250 |
37499 250 | = | 97 100 | a |
97 100 | a | = | 37499 250 |
| a | = | 37499 250 | ÷ | 97 100 |
| = | 37499 250 | × | 100 97 |
| = | 37499 5 | × | 2 97 |
| a | = | 74998 485 |
| a | = | 154.635052 |