| ( | i | − | 7 100 | ) | ÷ | ( | 8 100 | − | 7 100 | ) | = | - | 501 5000 | − | 73 10000 |
| Multiply both sides of the equation by: | ( | 8 100 | − | 7 100 | ) |
| ( | i | − | 7 100 | ) | = | - | 501 5000 | ( | 8 100 | − | 7 100 | ) | − | 73 10000 | ( | 8 100 | − | 7 100 | ) |
| i | − | 7 100 | = | - | 501 5000 | ( | 8 100 | − | 7 100 | ) | − | 73 10000 | ( | 8 100 | − | 7 100 | ) |
| i | − | 7 100 | = | - | 501 5000 | × | 8 100 | + | 501 5000 | × | 7 100 | − | 73 10000 | ( | 8 100 | − | 7 100 | ) |
| i | − | 7 100 | = | - | 501 62500 | + | 3507 500000 | − | 73 10000 | ( | 8 100 | − | 7 100 | ) |