| ( | 27 | − | 20 | x | ) | ÷ | ( | 9 | − | 100 | x | ) | = | ( | 24 | − | 30 | x | ) | ÷ | ( | 4 | − | 100 | x | ) |
| Multiply both sides of the equation by: | ( | 9 | − | 100 | x | ) | , | ( | 4 | − | 100 | x | ) |
| ( | 27 | − | 20 | x | ) | ( | 4 | − | 100 | x | ) | = | ( | 24 | − | 30 | x | ) | ( | 9 | − | 100 | x | ) |
| 27 | ( | 4 | − | 100 | x | ) | − | 20 | x | ( | 4 | − | 100 | x | ) | = | ( | 24 | − | 30 | x | ) | ( | 9 | − | 100 | x | ) |
| 27 | ( | 4 | − | 100 | x | ) | − | 20 | x | ( | 4 | − | 100 | x | ) | = | 24 | ( | 9 | − | 100 | x | ) | − | 30 | x | ( | 9 | − | 100 | x | ) |
| 27 | × | 4 | − | 27 | × | 100 | x | − | 20 | x | ( | 4 | − | 100 | x | ) | = | 24 | ( | 9 | − | 100 | x | ) | − | 30 | x | ( | 9 | − | 100 | x | ) |
| 27 | × | 4 | − | 27 | × | 100 | x | − | 20 | x | ( | 4 | − | 100 | x | ) | = | 24 | × | 9 | − | 24 | × | 100 | x | − | 30 | x | ( | 9 | − | 100 | x | ) |
| 108 | − | 2700 | x | − | 20 | x | ( | 4 | − | 100 | x | ) | = | 216 | − | 2400 | x | − | 30 | x | ( | 9 | − | 100 | x | ) |
| 108 | − | 2700 | x | − | 20 | x | × | 4 | + | 20 | x | × | 100 | x | = | 216 | − | 2400 | x | − | 30 | x | ( | 9 | − | 100 | x | ) |
| 108 | − | 2700 | x | − | 20 | x | × | 4 | + | 20 | x | × | 100 | x | = | 216 | − | 2400 | x | − | 30 | x | × | 9 | + | 30 | x | × | 100 | x |
| 108 | − | 2700 | x | − | 80 | x | + | 2000 | x | x | = | 216 | − | 2400 | x | − | 270 | x | + | 3000 | x | x |
| 108 | − | 2780 | x | + | 2000 | x | x | = | 216 | − | 2670 | x | + | 3000 | x | x |