- | 9 | ( | ( | - | 4 | − | x | ) | ( | - | 5 | ) | − | 4 | ) | − | ( | 2 | + | 8 | + | 2 | x | ) | ( | - | 18 | ) | = | 0 |
方程左边 = | - | 9 | ( | - | 4 | − | x | ) | ( | - | 5 | ) | + | 9 | × | 4 | − | ( | 2 | + | 8 | + | 2 | x | ) | ( | - | 18 | ) |
= | - | 9 | ( | - | 4 | − | x | ) | ( | - | 5 | ) | + | 36 | − | ( | 2 | + | 8 | + | 2 | x | ) | ( | - | 18 | ) |
= | 9 | × | 4 | ( | - | 5 | ) | + | 9 | x | ( | - | 5 | ) | + | 36 | − | ( | 2 | + | 8 | + | 2 | x | ) | ( | - | 18 | ) |
= | 36 | ( | - | 5 | ) | + | 9 | x | ( | - | 5 | ) | + | 36 | − | ( | 2 | + | 8 | + | 2 | x | ) | ( | - | 18 | ) |
= | - | 36 | × | 5 | + | 9 | x | ( | - | 5 | ) | + | 36 | − | ( | 2 | + | 8 | + | 2 | x | ) | ( | - | 18 | ) |
= | - | 180 | + | 9 | x | ( | - | 5 | ) | + | 36 | − | ( | 2 | + | 8 | + | 2 | x | ) | ( | - | 18 | ) |
= | - | 144 | + | 9 | x | ( | - | 5 | ) | − | ( | 2 | + | 8 | + | 2 | x | ) | ( | - | 18 | ) |
= | - | 144 | − | 9 | x | × | 5 | − | ( | 2 | + | 8 | + | 2 | x | ) | ( | - | 18 | ) |
= | - | 144 | − | 45 | x | − | ( | 2 | + | 8 | + | 2 | x | ) | ( | - | 18 | ) |
= | - | 144 | − | 45 | x | − | 2 | ( | - | 18 | ) | − | 8 | ( | - | 18 | ) | − | 2 | x | ( | - | 18 | ) |
= | - | 144 | − | 45 | x | + | 2 | × | 18 | − | 8 | ( | - | 18 | ) | − | 2 | x | ( | - | 18 | ) |
= | - | 144 | − | 45 | x | + | 36 | − | 8 | ( | - | 18 | ) | − | 2 | x | ( | - | 18 | ) |
= | - | 108 | − | 45 | x | − | 8 | ( | - | 18 | ) | − | 2 | x | ( | - | 18 | ) |
= | - | 108 | − | 45 | x | + | 8 | × | 18 | − | 2 | x | ( | - | 18 | ) |
= | - | 108 | − | 45 | x | + | 144 | − | 2 | x | ( | - | 18 | ) |
= | 36 | − | 45 | x | − | 2 | x | ( | - | 18 | ) |
= | 36 | − | 45 | x | + | 2 | x | × | 18 |
= | 36 | − | 45 | x | + | 36 | x |
= | 36 | − | 9 | x |
36 | − | 9 | x | = | 0 |
- | 9 | x | = | 0 | − | 36 |
- | 9 | x | = | - | 36 |
36 | = | 9 | x |
9 | x | = | 36 |
x | = | 36 | ÷ | 9 |
= | 36 | × | 1 9 |
= | 4 | × | 1 |
x | = | 4 |