| ( | 1520 | − | X | ÷ | 2 | + | 160 | ) | ÷ | 2 | = | 1520 | − | X | ÷ | 2 |
| Left side of the equation = | 1520 | × | 1 2 | − | X | ÷ | 2 | × | 1 2 | + | 160 | × | 1 2 |
| = | 760 | − | X | × | 1 4 | + | 80 |
| = | 840 | − | 1 4 | X |
| 840 | − | 1 4 | X | = | 1520 | − | X | ÷ | 2 |
| - | 1 4 | X | + | 1 2 | X | = | 1520 | − | 840 |
1 4 | X | = | 1520 | − | 840 |
1 4 | X | = | 680 |
| X | = | 680 | ÷ | 1 4 |
| = | 680 | × | 4 |
| X | = | 2720 |