| 30 | + | X | = | 93 100 | ( | 31 | + | X | ) |
| 方程右边 = | 93 100 | × | 31 | + | 93 100 | X |
| = | 2883 100 | + | 93 100 | X |
| 30 | + | X | = | 2883 100 | + | 93 100 | X |
| X | − | 93 100 | X | = | 2883 100 | − | 30 |
7 100 | X | = | 2883 100 | − | 30 |
7 100 | X | = | - | 117 100 |
| X | = | - | 117 100 | ÷ | 7 100 |
| = | - | 117 100 | × | 100 7 |
| = | - | 117 | × | 1 7 |
| X | = | - | 117 7 |
| X | = | - 16.714286 |