| ( | 10 | s | + | 1 | ) | ( | 2 | s | + | 1 | ) | ÷ | ( | ( | 100 | s | + | 1 | ) | ( | 1 5 | s | + | 1 | ) | ) | = | 1 |
| Multiply both sides of the equation by: | ( | ( | 100 | s | + | 1 | ) | ( | 1 5 | s | + | 1 | ) | ) |
| ( | 10 | s | + | 1 | ) | ( | 2 | s | + | 1 | ) | = | 1 | ( | ( | 100 | s | + | 1 | ) | ( | 1 5 | s | + | 1 | ) | ) |
| 10 | s | ( | 2 | s | + | 1 | ) | + | 1 | ( | 2 | s | + | 1 | ) | = | 1 | ( | ( | 100 | s | + | 1 | ) | ( | 1 5 | s | + | 1 | ) | ) |
| 10 | s | ( | 2 | s | + | 1 | ) | + | 1 | ( | 2 | s | + | 1 | ) | = | 1 | ( | 100 | s | + | 1 | ) | ( | 1 5 | s | + | 1 | ) |
| 10 | s | × | 2 | s | + | 10 | s | × | 1 | + | 1 | ( | 2 | s | + | 1 | ) | = | 1 | ( | 100 | s | + | 1 | ) | ( | 1 5 | s | + | 1 | ) |
| 10 | s | × | 2 | s | + | 10 | s | × | 1 | + | 1 | ( | 2 | s | + | 1 | ) | = | 1 | × | 100 | s | ( | 1 5 | s | + | 1 | ) | + | 1 | × | 1 | ( | 1 5 | s | + | 1 | ) |
| 20 | s | s | + | 10 | s | + | 1 | ( | 2 | s | + | 1 | ) | = | 100 | s | ( | 1 5 | s | + | 1 | ) | + | 1 | ( | 1 5 | s | + | 1 | ) |
| 20 | s | s | + | 10 | s | + | 1 | × | 2 | s | + | 1 | × | 1 | = | 100 | s | ( | 1 5 | s | + | 1 | ) | + | 1 | ( | 1 5 | s | + | 1 | ) |
| 20 | s | s | + | 10 | s | + | 1 | × | 2 | s | + | 1 | × | 1 | = | 100 | s | × | 1 5 | s | + | 100 | s | × | 1 | + | 1 | ( | 1 5 | s | + | 1 | ) |
| 20 | s | s | + | 10 | s | + | 2 | s | + | 1 | = | 20 | s | s | + | 100 | s | + | 1 | ( | 1 5 | s | + | 1 | ) |
| 20 | s | s | + | 12 | s | + | 1 | = | 20 | s | s | + | 100 | s | + | 1 | ( | 1 5 | s | + | 1 | ) |
| 20 | s | s | + | 12 | s | + | 1 | = | 20 | s | s | + | 100 | s | + | 1 | × | 1 5 | s | + | 1 | × | 1 |
| 20 | s | s | + | 12 | s | + | 1 | = | 20 | s | s | + | 100 | s | + | 1 5 | s | + | 1 |
| 20 | s | s | + | 12 | s | + | 1 | = | 20 | s | s | + | 501 5 | s | + | 1 |