| 100 | − | x | = | 1717 5000 | ( | 125 | − | x | ) | ÷ | 21 20 |
| Right side of the equation = | 1717 5250 | ( | 125 | − | x | ) |
| 100 | − | x | = | 1717 5250 | ( | 125 | − | x | ) |
| Right side of the equation = | 1717 5250 | × | 125 | − | 1717 5250 | x |
| = | 1717 42 | − | 1717 5250 | x |
| 100 | − | x | = | 1717 42 | − | 1717 5250 | x |
| - | x | + | 1717 5250 | x | = | 1717 42 | − | 100 |
| - | 3533 5250 | x | = | 1717 42 | − | 100 |
| - | 3533 5250 | x | = | - | 2483 42 |
2483 42 | = | 3533 5250 | x |
3533 5250 | x | = | 2483 42 |
| x | = | 2483 42 | ÷ | 3533 5250 |
| = | 2483 42 | × | 5250 3533 |
| = | 2483 | × | 125 3533 |
| x | = | 310375 3533 |
| x | = | 87.850269 |