| x | × | 5 | ( | 120 | ÷ | 18000 | + | 180 | ÷ | 20000 | + | 60 | ÷ | 50000 | ) | = | 1 |
| Left side of the equation = | x | × | 5 | × | 120 | ÷ | 18000 | + | x | × | 5 | × | 180 | ÷ | 20000 | + | x | × | 5 | × | 60 | ÷ | 50000 |
| = | x | × | 1 30 | + | x | × | 9 200 | + | x | × | 3 500 |
| = | 253 3000 | x |
253 3000 | x | = | 1 |
| x | = | 1 | ÷ | 253 3000 |
| = | 1 | × | 3000 253 |
| x | = | 3000 253 |
| x | = | 11.857708 |