47 50 | r | = | 1 | − | 1 | ÷ | ( | 1 | + | r | ) | × | 5 |
| Multiply both sides of the equation by: | ( | 1 | + | r | ) |
47 50 | r | ( | 1 | + | r | ) | = | 1 | ( | 1 | + | r | ) | − | 1 | × | 5 |
47 50 | r | × | 1 | + | 47 50 | r | r | = | 1 | ( | 1 | + | r | ) | − | 1 | × | 5 |
47 50 | r | × | 1 | + | 47 50 | r | r | = | 1 | × | 1 | + | 1 | r | − | 1 | × | 5 |
47 50 | r | + | 47 50 | r | r | = | 1 | + | 1 | r | − | 5 |
47 50 | r | + | 47 50 | r | r | = | - | 4 | + | 1 | r |