| ( | 1999 | ( | 1 | + | 20 100 | ) | ) | + | ( | 7 100 | x | ) | = | x |
| 方程左边 = | 1999 | ( | 1 | + | 20 100 | ) | + | ( | 7 100 | x | ) |
| = | 1999 | × | 1 | + | 1999 | × | 20 100 | + | ( | 7 100 | x | ) |
| = | 1999 | + | 1999 5 | + | ( | 7 100 | x | ) |
| = | 11994 5 | + | ( | 7 100 | x | ) |
| = | 11994 5 | + | 7 100 | x |
11994 5 | + | 7 100 | x | = | x |
7 100 | x | − | x | = | - | 11994 5 |
| - | 93 100 | x | = | - | 11994 5 |
11994 5 | = | 93 100 | x |
93 100 | x | = | 11994 5 |
| x | = | 11994 5 | ÷ | 93 100 |
| = | 11994 5 | × | 100 93 |
| = | 3998 | × | 20 31 |
| x | = | 79960 31 |
| x | = | 2579.354839 |