| 3 | x | × | 1 | + | 2 | x | × | 2 | + | 3 | x | × | 3 | = | 1 |
| 方程左边 = | 3 | x | + | 4 | x | + | 9 | x |
| = | 16 | x |
| 16 | x | = | 1 |
| x | = | 1 | ÷ | 16 |
| = | 1 | × | 1 16 |
| x | = | 1 16 |
| x | = | 0.0625 |
| x | × | 1 | + | 2 | x | × | 2 | + | 3 | x | × | 3 | = | 3 |
| 方程左边 = | x | × | 1 | + | 4 | x | + | 9 | x |
| = | 14 | x |
| 14 | x | = | 3 |
| x | = | 3 | ÷ | 14 |
| = | 3 | × | 1 14 |
| x | = | 3 14 |
| x | = | 0.214286 |
| 2 | x | × | 1 | + | 3 | x | × | 2 | + | 2 | x | × | 3 | = | 4 |
| 方程左边 = | 2 | x | + | 6 | x | + | 6 | x |
| = | 14 | x |
| 14 | x | = | 4 |
| x | = | 4 | ÷ | 14 |
| = | 4 | × | 1 14 |
| = | 2 | × | 1 7 |
| x | = | 2 7 |
| x | = | 0.285714 |