| 1 | ÷ | x | + | 2 | + | 1 | ÷ | x | + | 7 | = | 1 | ÷ | x | + | 3 | + | 1 | ÷ | x | + | 6 |
| Multiply both sides of the equation by: | x |
| 1 | + | 2 | x | + | 1 | ÷ | 1 | × | 1 | + | 7 | x | = | 1 | ÷ | 1 | × | 1 | + | 3 | x | + | 1 | ÷ | 1 | × | 1 | + | 6 | x |
| 2 | x | + | 7 | x | − | 3 | x | − | 6 | x | = | 1 | ÷ | 1 | × | 1 | + | 1 | ÷ | 1 | × | 1 | − | 1 | − | 1 | ÷ | 1 | × | 1 |
| 2 | x | + | 7 | x | − | 3 | x | − | 6 | x | = | 1 | + | 1 | − | 1 | − | 1 |
| 0 | x | = | 1 | + | 1 | − | 1 | − | 1 |
| 0 | x | = | 0 |