| X | + | 1 5 | X | + | 1 5 | ( | X | + | 1 5 | X | ) | + | 2160 | = | 36000 |
| Left side of the equation = | 6 5 | X | + | 1 5 | ( | X | + | 1 5 | X | ) | + | 2160 |
6 5 | X | + | 1 5 | ( | X | + | 1 5 | X | ) | + | 2160 | = | 36000 |
| Left side of the equation = | 6 5 | X | + | 1 5 | X | + | 1 5 | × | 1 5 | X | + | 2160 |
| = | 6 5 | X | + | 1 5 | X | + | 1 25 | X | + | 2160 |
| = | 36 25 | X | + | 2160 |
36 25 | X | + | 2160 | = | 36000 |
36 25 | X | = | 36000 | − | 2160 |
36 25 | X | = | 33840 |
| X | = | 33840 | ÷ | 36 25 |
| = | 33840 | × | 25 36 |
| = | 940 | × | 25 |
| X | = | 23500 |