163 5 | − | 3 | A | − | 1 | = | 252 5 | + | 2 | A | − | 1 |
| Left side of the equation = | 158 5 | − | 3 | A |
158 5 | − | 3 | A | = | 252 5 | + | 2 | A | − | 1 |
| Right side of the equation = | 247 5 | + | 2 | A |
158 5 | − | 3 | A | = | 247 5 | + | 2 | A |
| - | 3 | A | − | 2 | A | = | 247 5 | − | 158 5 |
| - | 5 | A | = | 247 5 | − | 158 5 |
| - | 5 | A | = | 89 5 |
| - | 89 5 | = | 5 | A |
| 5 | A | = | - | 89 5 |
| A | = | - | 89 5 | ÷ | 5 |
| = | - | 89 5 | × | 1 5 |
| A | = | - | 89 25 |
| A | = | - 3.56 |