| ( | ( | 765862 25 | + | a | + | 843 | + | 8000 | ) | − | 25000 | − | 4215 | ) | × | 3 100 | = | 21787 100 | + | a |
| 方程左边 = | ( | 765862 25 | + | a | + | 843 | + | 8000 | ) | × | 3 100 | − | 25000 | × | 3 100 | − | 4215 | × | 3 100 |
| = | ( | 765862 25 | + | a | + | 843 | + | 8000 | ) | × | 3 100 | − | 750 | − | 2529 20 |
| = | ( | 765862 25 | + | a | + | 843 | + | 8000 | ) | × | 3 100 | − | 17529 20 |
| = | 765862 25 | × | 3 100 | + | a | × | 3 100 | + | 843 | × | 3 100 | + | 8000 | × | 3 100 | − | 17529 20 |
| = | 1148793 1250 | + | a | × | 3 100 | + | 2529 100 | + | 240 | − | 17529 20 |
| = | 384843 1250 | + | 3 100 | a |
384843 1250 | + | 3 100 | a | = | 21787 100 | + | a |
3 100 | a | − | a | = | 21787 100 | − | 384843 1250 |
| - | 97 100 | a | = | 21787 100 | − | 384843 1250 |
| - | 97 100 | a | = | - | 225011 2500 |
225011 2500 | = | 97 100 | a |
97 100 | a | = | 225011 2500 |
| a | = | 225011 2500 | ÷ | 97 100 |
| = | 225011 2500 | × | 100 97 |
| = | 225011 25 | × | 1 97 |
| a | = | 225011 2425 |
| a | = | 92.788041 |