| ( | 6 5 | + | 5 | ) | ÷ | 2 | × | X | × | 36 | = | 500 |
| Left side of the equation = | ( | 6 5 | + | 5 | ) | × | 18 | X |
| ( | 6 5 | + | 5 | ) | × | 18 | X | = | 500 |
| Left side of the equation = | 6 5 | × | 18 | X | + | 5 | × | 18 | X |
| = | 108 5 | X | + | 90 | X |
| = | 558 5 | X |
558 5 | X | = | 500 |
| X | = | 500 | ÷ | 558 5 |
| = | 500 | × | 5 558 |
| = | 250 | × | 5 279 |
| X | = | 1250 279 |
| X | = | 4.480287 |