| A | − | ( | 6000 | × | 6 100 | ) | ( | 1 | − | 25 100 | ) | = | A | − | ( | 6000 | × | 6 100 | + | 2400 | × | 8 100 | ) | − | ( | 1 | − | 25 100 | ) |
| Left side of the equation = | A | − | 6000 | × | 6 100 | ( | 1 | − | 25 100 | ) |
| = | A | − | 360 | ( | 1 | − | 25 100 | ) |
| = | A | − | 360 | × | 1 | + | 360 | × | 25 100 |
| = | A | − | 360 | + | 90 |
| = | A | − | 270 |
| A | − | 270 | = | A | − | ( | 6000 | × | 6 100 | + | 2400 | × | 8 100 | ) | − | ( | 1 | − | 25 100 | ) |
| Right side of the equation = | A | − | 6000 | × | 6 100 | − | 2400 | × | 8 100 | − | ( | 1 | − | 25 100 | ) |
| = | A | − | 360 | − | 192 | − | ( | 1 | − | 25 100 | ) |
| = | A | − | 552 | − | ( | 1 | − | 25 100 | ) |
| = | A | − | 552 | − | 1 | + | 25 100 |
| = | A | − | 2211 4 |
| A | − | 270 | = | A | − | 2211 4 |
| A | − | A | = | - | 2211 4 | + | 270 |
| 0 | A | = | - | 2211 4 | + | 270 |
| 0 | A | = | - | 1131 4 |