| 111 | ÷ | ( | 519 5 | z | ) | = | 11 5 | ÷ | 44 |
| 方程两边同时乘以: | ( | 519 5 | z | ) |
| 111 | = | 11 5 | ÷ | 44 | × | ( | 519 5 | z | ) |
| 111 | = | 11 5 | ÷ | 44 | × | 519 5 | z |
| 111 | = | 519 100 | z |
| - | 519 100 | z | = | - | 111 |
| 111 | = | 519 100 | z |
519 100 | z | = | 111 |
| z | = | 111 | ÷ | 519 100 |
| = | 111 | × | 100 519 |
| = | 37 | × | 100 173 |
| z | = | 3700 173 |
| z | = | 21.387283 |