| 20 | × | 30 | − | 3 | x | × | 30 | × | 2 | − | 2 | x | × | 20 | × | 2 | + | 4 | ( | 3 | x | × | 2 | x | ) | = | 3 | ÷ | 4 | × | 20 | × | 30 |
| Left side of the equation = | 600 | − | 180 | x | − | 80 | x | + | 4 | ( | 3 | x | × | 2 | x | ) |
| = | 600 | − | 260 | x | + | 4 | ( | 3 | x | × | 2 | x | ) |
| 600 | − | 260 | x | + | 4 | ( | 3 | x | × | 2 | x | ) | = | 3 | ÷ | 4 | × | 20 | × | 30 |
| Left side of the equation = | 600 | − | 260 | x | + | 4 | × | 3 | x | × | 2 | x |
| = | 600 | − | 260 | x | + | 24 | x | x |
| 600 | − | 260 | x | + | 24 | x | x | = | 3 | ÷ | 4 | × | 20 | × | 30 |
| Right side of the equation = | 450 |
| 600 | − | 260 | x | + | 24 | x | x | = | 450 |