| X | + | 250 | + | ( | X | + | 250 | ) | ÷ | 15 | = | 600 |
| Left side of the equation = | X | + | 250 | + | X | × | 1 15 | + | 250 | × | 1 15 |
| = | X | + | 250 | + | X | × | 1 15 | + | 50 3 |
| = | 16 15 | X | + | 800 3 |
16 15 | X | + | 800 3 | = | 600 |
16 15 | X | = | 600 | − | 800 3 |
16 15 | X | = | 1000 3 |
| X | = | 1000 3 | ÷ | 16 15 |
| = | 1000 3 | × | 15 16 |
| = | 125 | × | 5 2 |
| X | = | 625 2 |
| X | = | 312.5 |