| 500 | x | × | 10 | = | 500 | ( | x | + | 10 | ) | × | 8 |
| Left side of the equation = | 5000 | x |
| 5000 | x | = | 500 | ( | x | + | 10 | ) | × | 8 |
| Right side of the equation = | 4000 | ( | x | + | 10 | ) |
| 5000 | x | = | 4000 | ( | x | + | 10 | ) |
| Right side of the equation = | 4000 | x | + | 4000 | × | 10 |
| = | 4000 | x | + | 40000 |
| 5000 | x | = | 4000 | x | + | 40000 |
| 5000 | x | − | 4000 | x | = | 40000 |
| 1000 | x | = | 40000 |
| x | = | 40000 | ÷ | 1000 |
| = | 40000 | × | 1 1000 |
| = | 40 | × | 1 |
| x | = | 40 |