| 3 | ( | 3 | − | 5 | x | ) | − | 4 | ( | 5 | + | 2 | x | ) | + | 16 | ( | 1 | − | 3 | x | ) | = | 0 |
| 方程左边 = | 3 | × | 3 | − | 3 | × | 5 | x | − | 4 | ( | 5 | + | 2 | x | ) | + | 16 | ( | 1 | − | 3 | x | ) |
| = | 9 | − | 15 | x | − | 4 | ( | 5 | + | 2 | x | ) | + | 16 | ( | 1 | − | 3 | x | ) |
| = | 9 | − | 15 | x | − | 4 | × | 5 | − | 4 | × | 2 | x | + | 16 | ( | 1 | − | 3 | x | ) |
| = | 9 | − | 15 | x | − | 20 | − | 8 | x | + | 16 | ( | 1 | − | 3 | x | ) |
| = | - | 11 | − | 23 | x | + | 16 | ( | 1 | − | 3 | x | ) |
| = | - | 11 | − | 23 | x | + | 16 | × | 1 | − | 16 | × | 3 | x |
| = | - | 11 | − | 23 | x | + | 16 | − | 48 | x |
| = | 5 | − | 71 | x |
| 5 | − | 71 | x | = | 0 |
| - | 71 | x | = | 0 | − | 5 |
| - | 71 | x | = | - | 5 |
| 5 | = | 71 | x |
| 71 | x | = | 5 |
| x | = | 5 | ÷ | 71 |
| = | 5 | × | 1 71 |
| x | = | 5 71 |
| x | = | 0.070423 |