| ( | ( | 9171341 100 | + | A | + | 843 | + | 8000 | ) | − | 55000 | − | 33834 5 | − | 843 | ) | × | 10 100 | − | 2520 | = | 5242 5 | + | A |
| 方程左边 = | ( | 9171341 100 | + | A | + | 843 | + | 8000 | ) | × | 10 100 | − | 55000 | × | 10 100 | − | 33834 5 | × | 10 100 | − | 843 | × | 10 100 | − | 2520 |
| = | ( | 9171341 100 | + | A | + | 843 | + | 8000 | ) | × | 10 100 | − | 5500 | − | 16917 25 | − | 843 10 | − | 2520 |
| = | ( | 9171341 100 | + | A | + | 843 | + | 8000 | ) | × | 10 100 | − | 439049 50 |
| = | 9171341 100 | × | 10 100 | + | A | × | 10 100 | + | 843 | × | 10 100 | + | 8000 | × | 10 100 | − | 439049 50 |
| = | 9171341 1000 | + | A | × | 10 100 | + | 843 10 | + | 800 | − | 439049 50 |
| = | 1274661 1000 | + | 10 100 | A |
1274661 1000 | + | 10 100 | A | = | 5242 5 | + | A |
10 100 | A | − | A | = | 5242 5 | − | 1274661 1000 |
| - | 9 10 | A | = | 5242 5 | − | 1274661 1000 |
| - | 9 10 | A | = | - | 226261 1000 |
226261 1000 | = | 9 10 | A |
9 10 | A | = | 226261 1000 |
| A | = | 226261 1000 | ÷ | 9 10 |
| = | 226261 1000 | × | 10 9 |
| = | 226261 100 | × | 1 9 |
| A | = | 226261 900 |
| A | = | 251.401111 |