| ( | ( | 220 | + | 220 | ) | ( | 63 | − | 7 | ) | − | X | ) | × | 9 10 | = | 2008913 100 |
| 方程左边 = | ( | 220 | + | 220 | ) | ( | 63 | − | 7 | ) | × | 9 10 | − | X | × | 9 10 |
| = | 220 | ( | 63 | − | 7 | ) | × | 9 10 | + | 220 | ( | 63 | − | 7 | ) | × | 9 10 | − | 9 10 | X |
| = | 198 | ( | 63 | − | 7 | ) | + | 198 | ( | 63 | − | 7 | ) | − | 9 10 | X |
| = | 198 | × | 63 | − | 198 | × | 7 | + | 198 | ( | 63 | − | 7 | ) | − | 9 10 | X |
| = | 12474 | − | 1386 | + | 198 | ( | 63 | − | 7 | ) | − | 9 10 | X |
| = | 11088 | + | 198 | ( | 63 | − | 7 | ) | − | 9 10 | X |
| = | 11088 | + | 198 | × | 63 | − | 198 | × | 7 | − | 9 10 | X |
| = | 11088 | + | 12474 | − | 1386 | − | 9 10 | X |
| = | 22176 | − | 9 10 | X |
| 22176 | − | 9 10 | X | = | 2008913 100 |
| - | 9 10 | X | = | 2008913 100 | − | 22176 |
| - | 9 10 | X | = | - | 208687 100 |
208687 100 | = | 9 10 | X |
9 10 | X | = | 208687 100 |
| X | = | 208687 100 | ÷ | 9 10 |
| = | 208687 100 | × | 10 9 |
| = | 208687 10 | × | 1 9 |
| X | = | 208687 90 |
| X | = | 2318.744444 |