| ( | 100 | − | x | ) | × | 21 25 | = | ( | 60 | − | x | ) | ÷ | 61 100 |
| Left side of the equation = | 100 | × | 21 25 | − | x | × | 21 25 |
| = | 84 | − | x | × | 21 25 |
| 84 | − | 21 25 | x | = | ( | 60 | − | x | ) | ÷ | 61 100 |
| Right side of the equation = | 60 | × | 100 61 | − | x | × | 100 61 |
| = | 6000 61 | − | x | × | 100 61 |
| 84 | − | 21 25 | x | = | 6000 61 | − | 100 61 | x |
| - | 21 25 | x | + | 100 61 | x | = | 6000 61 | − | 84 |
1219 1525 | x | = | 6000 61 | − | 84 |
1219 1525 | x | = | 876 61 |
| x | = | 876 61 | ÷ | 1219 1525 |
| = | 876 61 | × | 1525 1219 |
| = | 876 | × | 25 1219 |
| x | = | 21900 1219 |
| x | = | 17.965546 |