| 10000 | ( | x | + | 60 | ) | + | 30000 | x | = | 150 | x | ( | x | + | 60 | ) |
| Left side of the equation = | 10000 | x | + | 10000 | × | 60 | + | 30000 | x |
| = | 10000 | x | + | 600000 | + | 30000 | x |
| = | 40000 | x | + | 600000 |
| 40000 | x | + | 600000 | = | 150 | x | ( | x | + | 60 | ) |
| Right side of the equation = | 150 | x | x | + | 150 | x | × | 60 |
| = | 150 | x | x | + | 9000 | x |
| 40000 | x | + | 600000 | = | 150 | x | x | + | 9000 | x |