| 8 | t | − | 8 | × | 71 | = | 7 | × | 85 | − | 7 | t |
| Left side of the equation = | 8 | t | − | 568 |
| 8 | t | − | 568 | = | 7 | × | 85 | − | 7 | t |
| Right side of the equation = | 595 | − | 7 | t |
| 8 | t | − | 568 | = | 595 | − | 7 | t |
| 8 | t | + | 7 | t | = | 595 | + | 568 |
| 15 | t | = | 595 | + | 568 |
| 15 | t | = | 1163 |
| t | = | 1163 | ÷ | 15 |
| = | 1163 | × | 1 15 |
| t | = | 1163 15 |
| t | = | 77.533333 |