| ( | 5 | ( | 469 | + | X | ) | + | 112 | + | 69 | + | 26 | + | 31 | ) | ÷ | ( | 469 | + | 28 | + | 23 | + | 13 | + | 31 | + | X | ) | = | 23 5 |
| 方程两边同时乘以: | ( | 469 | + | 28 | + | 23 | + | 13 | + | 31 | + | X | ) |
| ( | 5 | ( | 469 | + | X | ) | + | 112 | + | 69 | + | 26 | + | 31 | ) | = | 23 5 | ( | 469 | + | 28 | + | 23 | + | 13 | + | 31 | + | X | ) |
| 5 | ( | 469 | + | X | ) | + | 112 | + | 69 | + | 26 | + | 31 | = | 23 5 | ( | 469 | + | 28 | + | 23 | + | 13 | + | 31 | + | X | ) |
| 5 | ( | 469 | + | X | ) | + | 112 | + | 69 | + | 26 | + | 31 | = | 23 5 | × | 469 | + | 23 5 | × | 28 | + | 23 5 | × | 23 | + | 23 5 | × | 13 | + | 23 5 | × | 31 | + | 23 5 | X |
| 5 | ( | 469 | + | X | ) | + | 112 | + | 69 | + | 26 | + | 31 | = | 10787 5 | + | 644 5 | + | 529 5 | + | 299 5 | + | 713 5 | + | 23 5 | X |
| 5 | ( | 469 | + | X | ) | + | 238 | = | 12972 5 | + | 23 5 | X |
| 5 | × | 469 | + | 5 | X | + | 238 | = | 12972 5 | + | 23 5 | X |
| 2345 | + | 5 | X | + | 238 | = | 12972 5 | + | 23 5 | X |
| 2583 | + | 5 | X | = | 12972 5 | + | 23 5 | X |
| 5 | X | − | 23 5 | X | = | 12972 5 | − | 2583 |
2 5 | X | = | 12972 5 | − | 2583 |
2 5 | X | = | 57 5 |
| X | = | 57 5 | ÷ | 2 5 |
| = | 57 5 | × | 5 2 |
| = | 57 | × | 1 2 |
| X | = | 57 2 |
| X | = | 28.5 |