| 3 | × | 12 | x | × | 5 2 | = | 5 | × | 12 | ( | x | + | 1 | ) |
| Left side of the equation = | 90 | x |
| 90 | x | = | 5 | × | 12 | ( | x | + | 1 | ) |
| Right side of the equation = | 60 | ( | x | + | 1 | ) |
| 90 | x | = | 60 | ( | x | + | 1 | ) |
| Right side of the equation = | 60 | x | + | 60 | × | 1 |
| = | 60 | x | + | 60 |
| 90 | x | = | 60 | x | + | 60 |
| 90 | x | − | 60 | x | = | 60 |
| 30 | x | = | 60 |
| x | = | 60 | ÷ | 30 |
| = | 60 | × | 1 30 |
| = | 2 | × | 1 |
| x | = | 2 |