| 100 | × | 10000 | + | 900000 | = | 10000 | p | − | 10000 | p | × | 5 100 | − | ( | 100 | × | 10000 | + | 900000 | ) |
| Left side of the equation = | 1000000 | + | 900000 |
| = | 1900000 |
| 1900000 | = | 10000 | p | − | 10000 | p | × | 5 100 | − | ( | 100 | × | 10000 | + | 900000 | ) |
| Right side of the equation = | 10000 | p | − | 500 | p | − | ( | 100 | × | 10000 | + | 900000 | ) |
| = | 9500 | p | − | ( | 100 | × | 10000 | + | 900000 | ) |
| 1900000 | = | 9500 | p | − | ( | 100 | × | 10000 | + | 900000 | ) |
| Right side of the equation = | 9500 | p | − | 100 | × | 10000 | − | 900000 |
| = | 9500 | p | − | 1000000 | − | 900000 |
| = | 9500 | p | − | 1900000 |
| 1900000 | = | 9500 | p | − | 1900000 |
| - | 9500 | p | = | - | 1900000 | − | 1900000 |
| - | 9500 | p | = | - | 3800000 |
| 3800000 | = | 9500 | p |
| 9500 | p | = | 3800000 |
| p | = | 3800000 | ÷ | 9500 |
| = | 3800000 | × | 1 9500 |
| = | 400 | × | 1 |
| p | = | 400 |