111 100 | ÷ | ( | X | − | 1889 100 | ) | = | 37 10 |
| 方程两边同时乘以: | ( | X | − | 1889 100 | ) |
111 100 | = | 37 10 | ( | X | − | 1889 100 | ) |
111 100 | = | 37 10 | X | − | 37 10 | × | 1889 100 |
111 100 | = | 37 10 | X | − | 69893 1000 |
| - | 37 10 | X | = | - | 69893 1000 | − | 111 100 |
| - | 37 10 | X | = | - | 71003 1000 |
71003 1000 | = | 37 10 | X |
37 10 | X | = | 71003 1000 |
| X | = | 71003 1000 | ÷ | 37 10 |
| = | 71003 1000 | × | 10 37 |
| = | 1919 100 | × | 1 |
| X | = | 1919 100 |
| X | = | 19.19 |