| x | = | 3600 | + | ( | ( | x | × | 4 5 | ) | × | 1 5 | ) |
| Right side of the equation = | 3600 | + | ( | x | × | 4 5 | ) | × | 1 5 |
| = | 3600 | + | x | × | 4 5 | × | 1 5 |
| = | 3600 | + | x | × | 4 25 |
| x | = | 3600 | + | 4 25 | x |
| x | − | 4 25 | x | = | 3600 |
21 25 | x | = | 3600 |
| x | = | 3600 | ÷ | 21 25 |
| = | 3600 | × | 25 21 |
| = | 1200 | × | 25 7 |
| x | = | 30000 7 |
| x | = | 4285.714286 |