- | 9 | ( | 16 | + | 4 | x | + | 4 | + | x | − | 4 | ) | + | 4 | ( | - | 6 | − | x | ) | ( | - | 13 | ) | = | 0 |
方程左边 = | - | 9 | × | 16 | − | 9 | × | 4 | x | − | 9 | × | 4 | − | 9 | x | + | 9 | × | 4 | + | 4 |
= | - | 144 | − | 36 | x | − | 36 | − | 9 | x | + | 36 | + | 4 | ( | - | 6 | − | x | ) | ( | - | 13 | ) |
= | - | 144 | − | 45 | x | + | 4 | ( | - | 6 | − | x | ) | ( | - | 13 | ) |
= | - | 144 | − | 45 | x | − | 4 | × | 6 | ( | - | 13 | ) | − | 4 | x | ( | - | 13 | ) |
= | - | 144 | − | 45 | x | − | 24 | ( | - | 13 | ) | − | 4 | x | ( | - | 13 | ) |
= | - | 144 | − | 45 | x | + | 24 | × | 13 | − | 4 | x | ( | - | 13 | ) |
= | - | 144 | − | 45 | x | + | 312 | − | 4 | x | ( | - | 13 | ) |
= | 168 | − | 45 | x | − | 4 | x | ( | - | 13 | ) |
= | 168 | − | 45 | x | + | 4 | x | × | 13 |
= | 168 | − | 45 | x | + | 52 | x |
= | 168 | + | 7 | x |
168 | + | 7 | x | = | 0 |
7 | x | = | 0 | − | 168 |
7 | x | = | - | 168 |
x | = | - | 168 | ÷ | 7 |
= | - | 168 | × | 1 7 |
= | - | 24 | × | 1 |
x | = | - | 24 |