| ( | 1 20 | − | x | ) | ( | 1 1000 | − | x | ) | ÷ | ( | 1 20 | + | x | ) | = | 7 4 | × | 1 10000 |
| Multiply both sides of the equation by: | ( | 1 20 | + | x | ) |
| ( | 1 20 | − | x | ) | ( | 1 1000 | − | x | ) | = | 7 4 | × | 1 10000 | ( | 1 20 | + | x | ) |
1 20 | ( | 1 1000 | − | x | ) | − | x | ( | 1 1000 | − | x | ) | = | 7 4 | × | 1 10000 | ( | 1 20 | + | x | ) |
1 20 | ( | 1 1000 | − | x | ) | − | x | ( | 1 1000 | − | x | ) | = | 7 4 | × | 1 10000 | × | 1 20 | + | 7 4 | × | 1 10000 | x |
1 20 | ( | 1 1000 | − | x | ) | − | x | ( | 1 1000 | − | x | ) | = | 7 800000 | + | 7 40000 | x |
1 20 | × | 1 1000 | − | 1 20 | x | − | x | ( | 1 1000 | − | x | ) | = | 7 800000 | + | 7 40000 | x |
1 20000 | − | 1 20 | x | − | x | ( | 1 1000 | − | x | ) | = | 7 800000 | + | 7 40000 | x |
1 20000 | − | 1 20 | x | − | x | × | 1 1000 | + | x | x | = | 7 800000 | + | 7 40000 | x |
1 20000 | − | 51 1000 | x | + | x | x | = | 7 800000 | + | 7 40000 | x |