| ( | ( | 970121 20 | + | a | + | 843 | + | 8000 | ) | − | 35000 | − | 5901 | ) | × | 3 100 | = | 10086 25 | + | a |
| 方程左边 = | ( | 970121 20 | + | a | + | 843 | + | 8000 | ) | × | 3 100 | − | 35000 | × | 3 100 | − | 5901 | × | 3 100 |
| = | ( | 970121 20 | + | a | + | 843 | + | 8000 | ) | × | 3 100 | − | 1050 | − | 17703 100 |
| = | ( | 970121 20 | + | a | + | 843 | + | 8000 | ) | × | 3 100 | − | 122703 100 |
| = | 970121 20 | × | 3 100 | + | a | × | 3 100 | + | 843 | × | 3 100 | + | 8000 | × | 3 100 | − | 122703 100 |
| = | 2910363 2000 | + | a | × | 3 100 | + | 2529 100 | + | 240 | − | 122703 100 |
| = | 986883 2000 | + | 3 100 | a |
986883 2000 | + | 3 100 | a | = | 10086 25 | + | a |
3 100 | a | − | a | = | 10086 25 | − | 986883 2000 |
| - | 97 100 | a | = | 10086 25 | − | 986883 2000 |
| - | 97 100 | a | = | - | 180003 2000 |
180003 2000 | = | 97 100 | a |
97 100 | a | = | 180003 2000 |
| a | = | 180003 2000 | ÷ | 97 100 |
| = | 180003 2000 | × | 100 97 |
| = | 180003 20 | × | 1 97 |
| a | = | 180003 1940 |
| a | = | 92.785052 |