10971 5 | = | ( | 87 | − | x | ) | × | 329 10 | + | 99 5 | x |
| 方程右边 = | 87 | × | 329 10 | − | x | × | 329 10 | + | 99 5 | x |
| = | 28623 10 | − | x | × | 329 10 | + | 99 5 | x |
| = | 28623 10 | − | 131 10 | x |
10971 5 | = | 28623 10 | − | 131 10 | x |
131 10 | x | = | 28623 10 | − | 10971 5 |
131 10 | x | = | 6681 10 |
| x | = | 6681 10 | ÷ | 131 10 |
| = | 6681 10 | × | 10 131 |
| = | 6681 | × | 1 131 |
| x | = | 6681 131 |
| x | = | 51 |