| ( | 77 5 | ( | 1 | + | 15 100 | ) | ) | + | ( | 5 100 | x | ) | = | x |
| 方程左边 = | 77 5 | ( | 1 | + | 15 100 | ) | + | ( | 5 100 | x | ) |
| = | 77 5 | × | 1 | + | 77 5 | × | 15 100 | + | ( | 5 100 | x | ) |
| = | 77 5 | + | 231 100 | + | ( | 5 100 | x | ) |
| = | 1771 100 | + | ( | 5 100 | x | ) |
| = | 1771 100 | + | 5 100 | x |
1771 100 | + | 5 100 | x | = | x |
5 100 | x | − | x | = | - | 1771 100 |
| - | 19 20 | x | = | - | 1771 100 |
1771 100 | = | 19 20 | x |
19 20 | x | = | 1771 100 |
| x | = | 1771 100 | ÷ | 19 20 |
| = | 1771 100 | × | 20 19 |
| = | 1771 5 | × | 1 19 |
| x | = | 1771 95 |
| x | = | 18.642105 |