| x | × | 1 | − | x | × | 2 | + | x | × | 3 | = | 3 |
| 方程左边 = | 2 | x |
| 2 | x | = | 3 |
| x | = | 3 | ÷ | 2 |
| = | 3 | × | 1 2 |
| x | = | 3 2 |
| x | = | 1.5 |
| x | × | 1 | + | 2 | x | × | 3 | = | 6 |
| 方程左边 = | x | × | 1 | + | 6 | x |
| = | 7 | x |
| 7 | x | = | 6 |
| x | = | 6 | ÷ | 7 |
| = | 6 | × | 1 7 |
| x | = | 6 7 |
| x | = | 0.857143 |
| x | × | 2 | + | x | × | 3 | = | 3 |
| 方程左边 = | 5 | x |
| 5 | x | = | 3 |
| x | = | 3 | ÷ | 5 |
| = | 3 | × | 1 5 |
| x | = | 3 5 |
| x | = | 0.6 |
| 3 | x | × | 1 | − | x | × | 2 | − | 4 | x | × | 3 | = | 13 |
| 方程左边 = | 3 | x | − | x | × | 2 | − | 12 | x |
| = | - | 11 | x |
| - | 11 | x | = | 13 |
| - | 13 | = | 11 | x |
| 11 | x | = | - | 13 |
| x | = | - | 13 | ÷ | 11 |
| = | - | 13 | × | 1 11 |
| x | = | - | 13 11 |
| x | = | - 1.181818 |