| x | − | ( | 1 | ÷ | 4 | × | x | + | 12 | + | ( | x | − | ( | 1 | ÷ | 4 | × | x | + | 12 | ) | ) | × | 3 | ÷ | 7 | ) | = | x | − | ( | 1 | ÷ | 4 | × | x | + | 12 | ) | − | ( | ( | x | − | 1 | ÷ | 4 | × | x | + | 12 | ) | × | 3 | ÷ | 7 | ) |
| Left side of the equation = | x | − | 1 | ÷ | 4 | × | x | − | 12 | − | ( | x | − | ( | 1 | ÷ | 4 | × | x | + | 12 | ) | ) | × | 3 | ÷ | 7 |
| = | x | − | 1 4 | x | − | 12 | − | ( | x | − | ( | 1 | ÷ | 4 | × | x | + | 12 | ) | ) | × | 3 7 |
| = | 3 4 | x | − | 12 | − | ( | x | − | ( | 1 | ÷ | 4 | × | x | + | 12 | ) | ) | × | 3 7 |
| = | 3 4 | x | − | 12 | − | x | × | 3 7 | + | ( | 1 | ÷ | 4 | × | x | + | 12 | ) | × | 3 7 |
| = | 9 28 | x | − | 12 | + | ( | 1 | ÷ | 4 | × | x | + | 12 | ) | × | 3 7 |
| = | 9 28 | x | − | 12 | + | 1 | ÷ | 4 | × | x | × | 3 7 | + | 12 | × | 3 7 |
| = | 9 28 | x | − | 12 | + | 3 28 | x | + | 36 7 |
| = | 3 7 | x | − | 48 7 |
3 7 | x | − | 48 7 | = | x | − | ( | 1 | ÷ | 4 | × | x | + | 12 | ) | − | ( | ( | x | − | 1 | ÷ | 4 | × | x | + | 12 | ) | × | 3 | ÷ | 7 | ) |
| Right side of the equation = | x | − | 1 | ÷ | 4 | × | x | − | 12 | − | ( | ( | x | − | 1 | ÷ | 4 | × | x | + | 12 | ) | × | 3 | ÷ | 7 | ) |
| = | x | − | 1 4 | x | − | 12 | − | ( | ( | x | − | 1 | ÷ | 4 | × | x | + | 12 | ) | × | 3 | ÷ | 7 | ) |
| = | 3 4 | x | − | 12 | − | ( | ( | x | − | 1 | ÷ | 4 | × | x | + | 12 | ) | × | 3 | ÷ | 7 | ) |
| = | 3 4 | x | − | 12 | − | ( | x | − | 1 | ÷ | 4 | × | x | + | 12 | ) | × | 3 | ÷ | 7 |
| = | 3 4 | x | − | 12 | − | ( | x | − | 1 | ÷ | 4 | × | x | + | 12 | ) | × | 3 7 |
| = | 3 4 | x | − | 12 | − | x | × | 3 7 | + | 1 | ÷ | 4 | × | x | × | 3 7 | − | 12 | × | 3 7 |
| = | 3 4 | x | − | 12 | − | x | × | 3 7 | + | 3 28 | x | − | 36 7 |
| = | 3 7 | x | − | 120 7 |
3 7 | x | − | 48 7 | = | 3 7 | x | − | 120 7 |
3 7 | x | − | 3 7 | x | = | - | 120 7 | + | 48 7 |
| 0 | x | = | - | 120 7 | + | 48 7 |
| 0 | x | = | - | 72 7 |