x | − | ( | ( | x | − | 5000 | × | 9 | ) | × | 10 | − | 2520 | ) | = | 148500 |
方程左边 = | x | − | ( | x | − | 5000 | × | 9 | ) | × | 10 | + | 2520 |
= | x | − | x | × | 10 | + | 5000 | × | 9 | × | 10 | + | 2520 |
= | x | − | x | × | 10 | + | 450000 | + | 2520 |
= | - | 9 | x | + | 452520 |
- | 9 | x | + | 452520 | = | 148500 |
- | 9 | x | = | 148500 | − | 452520 |
- | 9 | x | = | - | 304020 |
304020 | = | 9 | x |
9 | x | = | 304020 |
x | = | 304020 | ÷ | 9 |
= | 304020 | × | 1 9 |
= | 33780 | × | 1 |
x | = | 33780 |