| ( | 1 | + | x | ) | ÷ | 10521 10000 | = | 1 | + | x |
| Left side of the equation = | 1 | × | 10000 10521 | + | x | × | 10000 10521 |
| = | 10000 10521 | + | x | × | 10000 10521 |
10000 10521 | + | 10000 10521 | x | = | 1 | + | x |
10000 10521 | x | − | x | = | 1 | − | 10000 10521 |
| - | 521 10521 | x | = | 1 | − | 10000 10521 |
| - | 521 10521 | x | = | 521 10521 |
| - | 521 10521 | = | 521 10521 | x |
521 10521 | x | = | - | 521 10521 |
| x | = | - | 521 10521 | ÷ | 521 10521 |
| = | - | 521 10521 | × | 10521 521 |
| = | - | 521 167 | × | 167 521 |
| x | = | - | 87007 87007 |
| x | = | - | 1 |