| 12 | x | ( | 1 | − | ( | 1 | + | 4 100 | ) | − | ( | 7521 100 | − | 60 | ) | ) | ÷ | 4 100 | × | x | ( | 1 | + | 4 100 | ) | = | 0 |
| Left side of the equation = | 300 | x | ( | 1 | − | ( | 1 | + | 4 100 | ) | − | ( | 7521 100 | − | 60 | ) | ) | x | ( | 1 | + | 4 100 | ) |
| 300 | x | ( | 1 | − | ( | 1 | + | 4 100 | ) | − | ( | 7521 100 | − | 60 | ) | ) | x | ( | 1 | + | 4 100 | ) | = | 0 |
| Left side of the equation = | 300 | x | × | 1 | x | ( | 1 | + | 4 100 | ) | − | 300 | x | ( | 1 | + | 4 100 | ) | x | ( | 1 | + | 4 100 | ) | − | 300 | x |
| = | 300 | x | x | ( | 1 | + | 4 100 | ) | − | 300 | x | ( | 1 | + | 4 100 | ) | x | ( | 1 | + | 4 100 | ) | − | 300 | x | ( | 7521 100 | − | 60 | ) |
| = | 300 | x | x | × | 1 | + | 300 | x | x | × | 4 100 | − | 300 | x | ( | 1 | + | 4 100 | ) | x |
| = | 300 | x | x | + | 12 | x | x | − | 300 | x | ( | 1 | + | 4 100 | ) | x | ( | 1 | + | 4 100 | ) | − | 300 |
| = | 300 | x | x | + | 12 | x | x | − | 300 | x | × | 1 | x | ( | 1 | + | 4 100 | ) | − | 300 |
| = | 300 | x | x | + | 12 | x | x | − | 300 | x | x | ( | 1 | + | 4 100 | ) | − | 12 | x |
| = | 300 | x | x | + | 12 | x | x | − | 300 | x | x | × | 1 | − | 300 | x |
| = | 300 | x | x | + | 12 | x | x | − | 300 | x | x | − | 12 | x | x |
| = | 300 | x | x | + | 12 | x | x | − | 300 | x | x | − | 12 | x | x |
| = | 300 | x | x | + | 12 | x | x | − | 300 | x | x | − | 12 | x | x |
| = | 300 | x | x | + | 12 | x | x | − | 300 | x | x | − | 12 | x | x |
| = | 300 | x | x | + | 12 | x | x | − | 300 | x | x | − | 12 | x | x |
| = | 300 | x | x | + | 12 | x | x | − | 300 | x | x | − | 12 | x | x |
| = | 300 | x | x | + | 12 | x | x | − | 300 | x | x | − | 12 | x | x |
| = | 300 | x | x | + | 12 | x | x | − | 300 | x | x | − | 12 | x | x |
| = | 300 | x | x | + | 12 | x | x | − | 300 | x | x | − | 12 | x | x |
| 300 | x | x | + | 12 | x | x | − | 300 | x | x | − | 12 | x | x | = | 0 |