53 100 | ( | 1 | + | x | ) | ÷ | 10 100 | − | x | = | 81 5 |
| 方程左边 = | 53 10 | ( | 1 | + | x | ) | − | x |
53 10 | ( | 1 | + | x | ) | − | x | = | 81 5 |
| 方程左边 = | 53 10 | × | 1 | + | 53 10 | x | − | x |
| = | 53 10 | + | 53 10 | x | − | x |
| = | 53 10 | + | 43 10 | x |
53 10 | + | 43 10 | x | = | 81 5 |
43 10 | x | = | 81 5 | − | 53 10 |
43 10 | x | = | 109 10 |
| x | = | 109 10 | ÷ | 43 10 |
| = | 109 10 | × | 10 43 |
| = | 109 | × | 1 43 |
| x | = | 109 43 |
| x | = | 2.534884 |