| 99 | × | 3 10 | + | 97 | × | 49 100 | + | x | × | 21 100 | = | 96 |
| 方程左边 = | 297 10 | + | 4753 100 | + | x | × | 21 100 |
| = | 7723 100 | + | 21 100 | x |
7723 100 | + | 21 100 | x | = | 96 |
21 100 | x | = | 96 | − | 7723 100 |
21 100 | x | = | 1877 100 |
| x | = | 1877 100 | ÷ | 21 100 |
| = | 1877 100 | × | 100 21 |
| = | 1877 | × | 1 21 |
| x | = | 1877 21 |
| x | = | 89.380952 |