| 100 | × | 49 5 | + | x | × | 41 | = | ( | 100 | + | x | ) | × | 25 |
| 方程左边 = | 980 | + | x | × | 41 |
| 980 | + | 41 | x | = | ( | 100 | + | x | ) | × | 25 |
| 方程右边 = | 100 | × | 25 | + | x | × | 25 |
| = | 2500 | + | x | × | 25 |
| 980 | + | 41 | x | = | 2500 | + | 25 | x |
| 41 | x | − | 25 | x | = | 2500 | − | 980 |
| 16 | x | = | 2500 | − | 980 |
| 16 | x | = | 1520 |
| x | = | 1520 | ÷ | 16 |
| = | 1520 | × | 1 16 |
| = | 95 | × | 1 |
| x | = | 95 |