| ( | ( | 8285809 100 | + | A | + | 843 | + | 8000 | ) | − | 50000 | − | 29619 5 | − | 843 | ) | × | 3 100 | = | 103609 100 | + | A |
| 方程左边 = | ( | 8285809 100 | + | A | + | 843 | + | 8000 | ) | × | 3 100 | − | 50000 | × | 3 100 | − | 29619 5 | × | 3 100 | − | 843 | × | 3 100 |
| = | ( | 8285809 100 | + | A | + | 843 | + | 8000 | ) | × | 3 100 | − | 1500 | − | 88857 500 | − | 2529 100 |
| = | ( | 8285809 100 | + | A | + | 843 | + | 8000 | ) | × | 3 100 | − | 425751 250 |
| = | 8285809 100 | × | 3 100 | + | A | × | 3 100 | + | 843 | × | 3 100 | + | 8000 | × | 3 100 | − | 425751 250 |
| = | 24857427 10000 | + | A | × | 3 100 | + | 2529 100 | + | 240 | − | 425751 250 |
| = | 10480287 10000 | + | 3 100 | A |
10480287 10000 | + | 3 100 | A | = | 103609 100 | + | A |
3 100 | A | − | A | = | 103609 100 | − | 10480287 10000 |
| - | 97 100 | A | = | 103609 100 | − | 10480287 10000 |
| - | 97 100 | A | = | - | 119387 10000 |
119387 10000 | = | 97 100 | A |
97 100 | A | = | 119387 10000 |
| A | = | 119387 10000 | ÷ | 97 100 |
| = | 119387 10000 | × | 100 97 |
| = | 119387 100 | × | 1 97 |
| A | = | 119387 9700 |
| A | = | 12.307938 |