| 49 | x | = | 0 |
| x | = | 0 | ÷ | 49 |
| = | 0 | × | 1 49 |
| x | = | 0 |
| - | 28 | x | + | 4 | = | 0 |
| - | 28 | x | = | 0 | − | 4 |
| - | 28 | x | = | - | 4 |
| 4 | = | 28 | x |
| 28 | x | = | 4 |
| x | = | 4 | ÷ | 28 |
| = | 4 | × | 1 28 |
| = | 1 | × | 1 7 |
| x | = | 1 7 |
| x | = | 0.142857 |
| 3465 | x | = | 0 |
| x | = | 0 | ÷ | 3465 |
| = | 0 | × | 1 3465 |
| x | = | 0 |
| - | 5240 | x | = | 0 |
| - | 0 | = | 5240 | x |
| 5240 | x | = | - | 0 |
| x | = | - | 0 | ÷ | 5240 |
| = | - | 0 | × | 1 5240 |
| x | = | 0 |