| 90 | ( | - | 36 | p | + | 210 | ) | p | − | 45 2 | ( | - | 36 | p | + | 210 | ) | p | − | 33000 | = | 0 |
| Left side of the equation = | - | 90 | × | 36 | p | p | + | 90 | × | 210 | p | − | 45 2 | ( | - | 36 | p | + | 210 | ) | p | − | 33000 |
| = | - | 3240 | p | p | + | 18900 | p | − | 45 2 | ( | - | 36 | p | + | 210 | ) | p | − | 33000 |
| = | - | 3240 | p | p | + | 18900 | p | + | 45 2 | × | 36 | p | p | − | 45 2 | × | 210 | p |
| = | - | 3240 | p | p | + | 18900 | p | + | 810 | p | p | − | 4725 | p | − | 33000 |
| = | - | 3240 | p | p | + | 14175 | p | + | 810 | p | p | − | 33000 |
| - | 3240 | p | p | + | 14175 | p | + | 810 | p | p | − | 33000 | = | 0 |