| 10 | x | = | 21 100 | ( | 100 | − | 10 | x | ) | − | 0 | × | 71 100 |
| Right side of the equation = | 21 100 | ( | 100 | − | 10 | x | ) | − | 0 |
| 10 | x | = | 21 100 | ( | 100 | − | 10 | x | ) | − | 0 |
| Right side of the equation = | 21 100 | × | 100 | − | 21 100 | × | 10 | x | − | 0 |
| = | 21 | − | 21 10 | x | − | 0 |
| = | 21 | − | 21 10 | x |
| 10 | x | = | 21 | − | 21 10 | x |
| 10 | x | + | 21 10 | x | = | 21 |
121 10 | x | = | 21 |
| x | = | 21 | ÷ | 121 10 |
| = | 21 | × | 10 121 |
| x | = | 210 121 |
| x | = | 1.735537 |