| 1 | ÷ | ( | 10000 | x | ) | = | 21 20 | × | 253 100 | ÷ | 100000000 | − | 1 | ÷ | 1050000 |
| Multiply both sides of the equation by: | ( | 10000 | x | ) |
| 1 | = | 21 20 | × | 253 100 | ÷ | 100000000 | × | ( | 10000 | x | ) | − | 1 | ÷ | 1050000 | × | ( | 10000 | x | ) |
| 1 | = | 21 20 | × | 253 100 | ÷ | 100000000 | × | 10000 | x | − | 1 | ÷ | 1050000 | × | ( | 10000 | x | ) |