| ( | 1000 | + | x | ) | × | 5 | + | ( | 300 | + | 100 | ) | × | 5 | × | 3 | = | 24000 |
| Left side of the equation = | ( | 1000 | + | x | ) | × | 5 | + | ( | 300 | + | 100 | ) | × | 15 |
| ( | 1000 | + | x | ) | × | 5 | + | ( | 300 | + | 100 | ) | × | 15 | = | 24000 |
| Left side of the equation = | 1000 | × | 5 | + | x | × | 5 | + | ( | 300 | + | 100 | ) | × | 15 |
| = | 5000 | + | x | × | 5 | + | ( | 300 | + | 100 | ) | × | 15 |
| = | 5000 | + | 5 | x | + | 300 | × | 15 | + | 100 | × | 15 |
| = | 5000 | + | 5 | x | + | 4500 | + | 1500 |
| = | 11000 | + | 5 | x |
| 11000 | + | 5 | x | = | 24000 |
| 5 | x | = | 24000 | − | 11000 |
| 5 | x | = | 13000 |
| x | = | 13000 | ÷ | 5 |
| = | 13000 | × | 1 5 |
| = | 2600 | × | 1 |
| x | = | 2600 |