| x | × | 2 | − | 14 | x | + | 13 | = | 0 |
| 方程左边 = | - | 12 | x | + | 13 |
| - | 12 | x | + | 13 | = | 0 |
| - | 12 | x | = | 0 | − | 13 |
| - | 12 | x | = | - | 13 |
| 13 | = | 12 | x |
| 12 | x | = | 13 |
| x | = | 13 | ÷ | 12 |
| = | 13 | × | 1 12 |
| x | = | 13 12 |
| x | = | 1.083333 |
| 520 | x | × | 2 | − | 13 | x | − | 14520 | x | × | 2 | + | 14 | x | − | 13 | = | 0 |
| 方程左边 = | 1040 | x | − | 13 | x | − | 29040 | x | + | 14 | x | − | 13 |
| = | - | 27999 | x | − | 13 |
| - | 27999 | x | − | 13 | = | 0 |
| - | 27999 | x | = | 0 | + | 13 |
| - | 27999 | x | = | 13 |
| - | 13 | = | 27999 | x |
| 27999 | x | = | - | 13 |
| x | = | - | 13 | ÷ | 27999 |
| = | - | 13 | × | 1 27999 |
| x | = | - | 13 27999 |
| x | = | - 0.000464 |