| 12 | = | 3 5 | ( | 1 | + | R | × | 1 | ÷ | 1000 | ) |
| Right side of the equation = | 3 5 | × | 1 | + | 3 5 | R | × | 1 | ÷ | 1000 |
| = | 3 5 | + | 3 5000 | R |
| 12 | = | 3 5 | + | 3 5000 | R |
| - | 3 5000 | R | = | 3 5 | − | 12 |
| - | 3 5000 | R | = | - | 57 5 |
57 5 | = | 3 5000 | R |
3 5000 | R | = | 57 5 |
| R | = | 57 5 | ÷ | 3 5000 |
| = | 57 5 | × | 5000 3 |
| = | 19 | × | 1000 |
| R | = | 19000 |