| ( | 4 | − | 6 | X | ) | ÷ | 1 100 | − | 13 2 | = | ( | 1 50 | − | 4 | X | ) | ÷ | 1 50 | − | 15 2 |
| Left side of the equation = | 4 | × | 100 | − | 6 | X | × | 100 | − | 13 2 |
| = | 400 | − | 600 | X | − | 13 2 |
| = | 787 2 | − | 600 | X |
787 2 | − | 600 | X | = | ( | 1 50 | − | 4 | X | ) | ÷ | 1 50 | − | 15 2 |
| Right side of the equation = | 1 50 | × | 50 | − | 4 | X | × | 50 | − | 15 2 |
| = | 1 | − | 200 | X | − | 15 2 |
| = | - | 13 2 | − | 200 | X |
787 2 | − | 600 | X | = | - | 13 2 | − | 200 | X |
| - | 600 | X | + | 200 | X | = | - | 13 2 | − | 787 2 |
| - | 400 | X | = | - | 13 2 | − | 787 2 |
| - | 400 | X | = | - | 400 |
| 400 | = | 400 | X |
| 400 | X | = | 400 |
| X | = | 400 | ÷ | 400 |
| = | 400 | × | 1 400 |
| = | 1 | × | 1 |
| X | = | 1 |