78 5 | × | 23 | ÷ | 48 | + | 5 | + | 80 | + | 23 | × | 100 100 | = | x | × | 23 | ÷ | 23 | + | 71 2 | × | 100 100 |
| 方程左边 = | 299 40 | + | 5 | + | 80 | + | 23 |
| = | 4619 40 |
4619 40 | = | x | × | 23 | ÷ | 23 | + | 71 2 | × | 100 100 |
| 方程右边 = | x | × | 1 | + | 71 2 |
4619 40 | = | 1 | x | + | 71 2 |
| - | 1 | x | = | 71 2 | − | 4619 40 |
| - | x | = | 71 2 | − | 4619 40 |
| - | x | = | - | 3199 40 |
3199 40 | = | x |
| x | = | 3199 40 |