( | 22 | − | x | ) | + | ( | 23 | − | x | ) | + | ( | 16 | − | x | ) | + | ( | 20 | − | x | ) | = | 72 | − | x |
方程左边 = | 22 | − | x | + | ( | 23 | − | x | ) | + | ( | 16 | − | x | ) | + | ( | 20 | − | x | ) |
= | 22 | − | x | + | 23 | − | x | + | ( | 16 | − | x | ) | + | ( | 20 | − | x | ) |
= | 45 | − | 2 | x | + | ( | 16 | − | x | ) | + | ( | 20 | − | x | ) |
= | 45 | − | 2 | x | + | 16 | − | x | + | ( | 20 | − | x | ) |
= | 61 | − | 3 | x | + | ( | 20 | − | x | ) |
= | 61 | − | 3 | x | + | 20 | − | x |
= | 81 | − | 4 | x |
81 | − | 4 | x | = | 72 | − | x |
- | 4 | x | + | x | = | 72 | − | 81 |
- | 3 | x | = | 72 | − | 81 |
- | 3 | x | = | - | 9 |
9 | = | 3 | x |
3 | x | = | 9 |
x | = | 9 | ÷ | 3 |
= | 9 | × | 1 3 |
= | 3 | × | 1 |
x | = | 3 |