| 5 | m | + | 1 | ÷ | 4 | + | 5 | ( | m | + | 1 | ÷ | 4 | ) | = | 0 |
| 方程左边 = | 5 | m | + | 1 4 | + | 5 | ( | m | + | 1 | ÷ | 4 | ) |
| 5 | m | + | 1 4 | + | 5 | ( | m | + | 1 | ÷ | 4 | ) | = | 0 |
| 方程左边 = | 5 | m | + | 1 4 | + | 5 | m | + | 5 | × | 1 | ÷ | 4 |
| = | 5 | m | + | 1 4 | + | 5 | m | + | 5 4 |
| = | 10 | m | + | 3 2 |
| 10 | m | + | 3 2 | = | 0 |
| 10 | m | = | 0 | − | 3 2 |
| 10 | m | = | - | 3 2 |
| m | = | - | 3 2 | ÷ | 10 |
| = | - | 3 2 | × | 1 10 |
| m | = | - | 3 20 |
| m | = | - 0.15 |