| ( | 71 | ( | 1 | + | 15 100 | ) | ) | + | ( | 3 100 | x | ) | = | x |
| 方程左边 = | 71 | ( | 1 | + | 15 100 | ) | + | ( | 3 100 | x | ) |
| = | 71 | × | 1 | + | 71 | × | 15 100 | + | ( | 3 100 | x | ) |
| = | 71 | + | 213 20 | + | ( | 3 100 | x | ) |
| = | 1633 20 | + | ( | 3 100 | x | ) |
| = | 1633 20 | + | 3 100 | x |
1633 20 | + | 3 100 | x | = | x |
3 100 | x | − | x | = | - | 1633 20 |
| - | 97 100 | x | = | - | 1633 20 |
1633 20 | = | 97 100 | x |
97 100 | x | = | 1633 20 |
| x | = | 1633 20 | ÷ | 97 100 |
| = | 1633 20 | × | 100 97 |
| = | 1633 | × | 5 97 |
| x | = | 8165 97 |
| x | = | 84.175258 |