| ( | 1 20 | − | x | ) | ( | 1 1000 | − | x | ) | ÷ | ( | 1 20 | + | x | ) | = | 7 4 | × | 10 | − | 5 |
| Multiply both sides of the equation by: | ( | 1 20 | + | x | ) |
| ( | 1 20 | − | x | ) | ( | 1 1000 | − | x | ) | = | 7 4 | × | 10 | ( | 1 20 | + | x | ) | − | 5 | ( | 1 20 | + | x | ) |
1 20 | ( | 1 1000 | − | x | ) | − | x | ( | 1 1000 | − | x | ) | = | 7 4 | × | 10 | ( | 1 20 | + | x | ) | − | 5 | ( | 1 20 | + | x | ) |
1 20 | ( | 1 1000 | − | x | ) | − | x | ( | 1 1000 | − | x | ) | = | 7 4 | × | 10 | × | 1 20 | + | 7 4 | × | 10 | x | − | 5 | ( | 1 20 | + | x | ) |
1 20 | ( | 1 1000 | − | x | ) | − | x | ( | 1 1000 | − | x | ) | = | 7 8 | + | 35 2 | x | − | 5 | ( | 1 20 | + | x | ) |
1 20 | × | 1 1000 | − | 1 20 | x | − | x | ( | 1 1000 | − | x | ) | = | 7 8 | + | 35 2 | x | − | 5 | ( | 1 20 | + | x | ) |
1 20 | × | 1 1000 | − | 1 20 | x | − | x | ( | 1 1000 | − | x | ) | = | 7 8 | + | 35 2 | x | − | 5 | × | 1 20 | − | 5 | x |
1 20000 | − | 1 20 | x | − | x | ( | 1 1000 | − | x | ) | = | 7 8 | + | 35 2 | x | − | 1 4 | − | 5 | x |
1 20000 | − | 1 20 | x | − | x | ( | 1 1000 | − | x | ) | = | 5 8 | + | 25 2 | x |
1 20000 | − | 1 20 | x | − | x | × | 1 1000 | + | x | x | = | 5 8 | + | 25 2 | x |
1 20000 | − | 51 1000 | x | + | x | x | = | 5 8 | + | 25 2 | x |