| 180 | ÷ | 11 | = | 10 | ( | 10 | − | 2 | t | ) |
| Left side of the equation = | 180 11 |
180 11 | = | 10 | ( | 10 | − | 2 | t | ) |
| Right side of the equation = | 10 | × | 10 | − | 10 | × | 2 | t |
| = | 100 | − | 20 | t |
180 11 | = | 100 | − | 20 | t |
| 20 | t | = | 100 | − | 180 11 |
| 20 | t | = | 920 11 |
| t | = | 920 11 | ÷ | 20 |
| = | 920 11 | × | 1 20 |
| = | 46 11 | × | 1 |
| t | = | 46 11 |
| t | = | 4.181818 |