( | 4 5 | x | - | ( | x | - | 60 | ) | ) | × | 10 | = | ( | ( | x | - | 30 | ) | - | ( | x | - | 60 | ) | ) |
方程左边 = | 4 5 | x | × | 10 | - | ( | x | - | 60 | ) | × | 10 |
= | 8 | x | - | ( | x | - | 60 | ) | × | 10 |
= | 8 | x | - | x | × | 10 | + | 60 | × | 10 |
= | 8 | x | - | x | × | 10 | + | 600 |
= | - | 2 | x | + | 600 |
- | 2 | x | + | 600 | = | ( | ( | x | - | 30 | ) | - | ( | x | - | 60 | ) | ) |
方程右边 = | ( | x | - | 30 | ) | - | ( | x | - | 60 | ) |
= | x | - | 30 | - | ( | x | - | 60 | ) |
= | x | - | 30 | - | x | + | 60 |
= | 0 | x | + | 30 |
- | 2 | x | + | 600 | = | 0 | x | + | 30 |
- | 2 | x | = | 30 | - | 600 |
- | 2 | x | = | - | 570 |
2 | x | = | 570 |
x | = | 570 | ÷ | 2 |
= | 570 | × | 1 2 |
= | 285 | × | 1 |
x | = | 285 |