| ( | 100 | + | x | ) | ÷ | 5 | × | 67 100 | = | x |
| 方程左边 = | ( | 100 | + | x | ) | × | 67 500 |
| ( | 100 | + | x | ) | × | 67 500 | = | x |
| 方程左边 = | 100 | × | 67 500 | + | x | × | 67 500 |
| = | 67 5 | + | x | × | 67 500 |
67 5 | + | 67 500 | x | = | x |
67 500 | x | − | x | = | - | 67 5 |
| - | 433 500 | x | = | - | 67 5 |
67 5 | = | 433 500 | x |
433 500 | x | = | 67 5 |
| x | = | 67 5 | ÷ | 433 500 |
| = | 67 5 | × | 500 433 |
| = | 67 | × | 100 433 |
| x | = | 6700 433 |
| x | = | 15.473441 |