| 4 | X | + | 1 | ÷ | 4 | × | ( | 210 | − | X | ) | = | 240 |
| Left side of the equation = | 4 | X | + | 1 4 | ( | 210 | − | X | ) |
| 4 | X | + | 1 4 | ( | 210 | − | X | ) | = | 240 |
| Left side of the equation = | 4 | X | + | 1 4 | × | 210 | − | 1 4 | X |
| = | 4 | X | + | 105 2 | − | 1 4 | X |
| = | 15 4 | X | + | 105 2 |
15 4 | X | + | 105 2 | = | 240 |
15 4 | X | = | 240 | − | 105 2 |
15 4 | X | = | 375 2 |
| X | = | 375 2 | ÷ | 15 4 |
| = | 375 2 | × | 4 15 |
| = | 25 | × | 2 |
| X | = | 50 |