| ( | 10 | ( | X | − | 10 | ) | − | 96 | ) | × | 75 100 | = | 81 50 | X |
| Left side of the equation = | 10 | ( | X | − | 10 | ) | × | 75 100 | − | 96 | × | 75 100 |
| = | 15 2 | ( | X | − | 10 | ) | − | 72 |
| = | 15 2 | X | − | 15 2 | × | 10 | − | 72 |
| = | 15 2 | X | − | 75 | − | 72 |
| = | 15 2 | X | − | 147 |
15 2 | X | − | 147 | = | 81 50 | X |
15 2 | X | − | 81 50 | X | = | 147 |
147 25 | X | = | 147 |
| X | = | 147 | ÷ | 147 25 |
| = | 147 | × | 25 147 |
| = | 1 | × | 25 |
| X | = | 25 |