| ( | 1000 | + | x | ) | × | 10 | + | ( | 300 | + | 100 | ) | × | 10 | × | 3 | = | 24000 |
| Left side of the equation = | ( | 1000 | + | x | ) | × | 10 | + | ( | 300 | + | 100 | ) | × | 30 |
| ( | 1000 | + | x | ) | × | 10 | + | ( | 300 | + | 100 | ) | × | 30 | = | 24000 |
| Left side of the equation = | 1000 | × | 10 | + | x | × | 10 | + | ( | 300 | + | 100 | ) | × | 30 |
| = | 10000 | + | x | × | 10 | + | ( | 300 | + | 100 | ) | × | 30 |
| = | 10000 | + | 10 | x | + | 300 | × | 30 | + | 100 | × | 30 |
| = | 10000 | + | 10 | x | + | 9000 | + | 3000 |
| = | 22000 | + | 10 | x |
| 22000 | + | 10 | x | = | 24000 |
| 10 | x | = | 24000 | − | 22000 |
| 10 | x | = | 2000 |
| x | = | 2000 | ÷ | 10 |
| = | 2000 | × | 1 10 |
| = | 200 | × | 1 |
| x | = | 200 |