| ( | x | + | 6 | ) | x | × | 20 | = | ( | x | + | 6 | + | x | ) | x | × | 12 |
| Left side of the equation = | x | x | × | 20 | + | 6 | x | × | 20 |
| = | x | x | × | 20 | + | 120 | x |
| x | x | × | 20 | + | 120 | x | = | ( | x | + | 6 | + | x | ) | x | × | 12 |
| Right side of the equation = | x | x | × | 12 | + | 6 | x | × | 12 | + | x | x | × | 12 |
| = | x | x | × | 12 | + | 72 | x | + | x | x | × | 12 |
| x | x | × | 20 | + | 120 | x | = | x | x | × | 12 | + | 72 | x | + | x | x | × | 12 |