| X | + | 1 5 | X | + | 1 5 | ( | X | + | 1 5 | X | ) | + | 27000 | = | 450000 |
| Left side of the equation = | 6 5 | X | + | 1 5 | ( | X | + | 1 5 | X | ) | + | 27000 |
6 5 | X | + | 1 5 | ( | X | + | 1 5 | X | ) | + | 27000 | = | 450000 |
| Left side of the equation = | 6 5 | X | + | 1 5 | X | + | 1 5 | × | 1 5 | X | + | 27000 |
| = | 6 5 | X | + | 1 5 | X | + | 1 25 | X | + | 27000 |
| = | 36 25 | X | + | 27000 |
36 25 | X | + | 27000 | = | 450000 |
36 25 | X | = | 450000 | − | 27000 |
36 25 | X | = | 423000 |
| X | = | 423000 | ÷ | 36 25 |
| = | 423000 | × | 25 36 |
| = | 11750 | × | 25 |
| X | = | 293750 |