| x | − | 165 | × | 12 | − | ( | 1500 | + | 250 | × | 12 | ) | = | 0 |
| Left side of the equation = | x | − | 1980 | − | ( | 1500 | + | 250 | × | 12 | ) |
| x | − | 1980 | − | ( | 1500 | + | 250 | × | 12 | ) | = | 0 |
| Left side of the equation = | x | − | 1980 | − | 1500 | − | 250 | × | 12 |
| = | x | − | 1980 | − | 1500 | − | 3000 |
| = | x | − | 6480 |
| x | − | 6480 | = | 0 |
| x | = | 0 | + | 6480 |
| x | = | 6480 |