| ( | x | + | 5 | ) | ( | 6 | x | − | 1 | ) | + | 22 | ( | 2 | x | + | 7 | ) | = | 3 | ( | 2 | x | + | 7 | ) | ( | x | + | 5 | ) |
| Left side of the equation = | x | ( | 6 | x | − | 1 | ) | + | 5 | ( | 6 | x | − | 1 | ) | + | 22 | ( | 2 | x | + | 7 | ) |
| = | x | × | 6 | x | − | x | × | 1 | + | 5 | ( | 6 | x | − | 1 | ) | + | 22 | ( | 2 | x | + | 7 | ) |
| = | x | × | 6 | x | − | 1 | x | + | 5 | × | 6 | x | − | 5 | × | 1 | + | 22 | ( | 2 | x | + | 7 | ) |
| = | x | × | 6 | x | − | 1 | x | + | 30 | x | − | 5 | + | 22 | ( | 2 | x | + | 7 | ) |
| = | x | × | 6 | x | + | 29 | x | − | 5 | + | 22 | ( | 2 | x | + | 7 | ) |
| = | x | × | 6 | x | + | 29 | x | − | 5 | + | 22 | × | 2 | x | + | 22 | × | 7 |
| = | x | × | 6 | x | + | 29 | x | − | 5 | + | 44 | x | + | 154 |
| = | x | × | 6 | x | + | 73 | x | + | 149 |
| x | × | 6 | x | + | 73 | x | + | 149 | = | 3 | ( | 2 | x | + | 7 | ) | ( | x | + | 5 | ) |
| Right side of the equation = | 3 | × | 2 | x | ( | x | + | 5 | ) | + | 3 | × | 7 | ( | x | + | 5 | ) |
| = | 6 | x | ( | x | + | 5 | ) | + | 21 | ( | x | + | 5 | ) |
| = | 6 | x | x | + | 6 | x | × | 5 | + | 21 | ( | x | + | 5 | ) |
| = | 6 | x | x | + | 30 | x | + | 21 | ( | x | + | 5 | ) |
| = | 6 | x | x | + | 30 | x | + | 21 | x | + | 21 | × | 5 |
| = | 6 | x | x | + | 30 | x | + | 21 | x | + | 105 |
| = | 6 | x | x | + | 51 | x | + | 105 |
| x | × | 6 | x | + | 73 | x | + | 149 | = | 6 | x | x | + | 51 | x | + | 105 |