| 5 | × | 3 | + | ( | 4 | × | 5 | ) | × | 3 | + | 6 | t | = | 60 |
| Left side of the equation = | 15 | + | ( | 4 | × | 5 | ) | × | 3 | + | 6 | t |
| 15 | + | ( | 4 | × | 5 | ) | × | 3 | + | 6 | t | = | 60 |
| Left side of the equation = | 15 | + | 4 | × | 5 | × | 3 | + | 6 | t |
| = | 15 | + | 60 | + | 6 | t |
| = | 75 | + | 6 | t |
| 75 | + | 6 | t | = | 60 |
| 6 | t | = | 60 | − | 75 |
| 6 | t | = | - | 15 |
| t | = | - | 15 | ÷ | 6 |
| = | - | 15 | × | 1 6 |
| = | - | 5 | × | 1 2 |
| t | = | - | 5 2 |
| t | = | - 2.5 |