| 100000 | + | 6 | x | × | 5 | = | 190000 | + | 2 | x | × | 5 |
| 方程左边 = | 100000 | + | 30 | x |
| 100000 | + | 30 | x | = | 190000 | + | 2 | x | × | 5 |
| 方程右边 = | 190000 | + | 10 | x |
| 100000 | + | 30 | x | = | 190000 | + | 10 | x |
| 30 | x | − | 10 | x | = | 190000 | − | 100000 |
| 20 | x | = | 190000 | − | 100000 |
| 20 | x | = | 90000 |
| x | = | 90000 | ÷ | 20 |
| = | 90000 | × | 1 20 |
| = | 4500 | × | 1 |
| x | = | 4500 |