| ( | ( | 1 | ÷ | x | ) | + | ( | 1 | ÷ | 10 | ) | ) | × | 1 2 | = | ( | ( | 1 | ÷ | x | ) | + | ( | 1 | ÷ | 30 | ) | ) | × | 3 10 |
| ( | 1 | ÷ | x | ) | × | 1 2 | + | ( | 1 | ÷ | 10 | ) | × | 1 2 | = | ( | ( | 1 | ÷ | x | ) | + | ( | 1 | ÷ | 30 | ) | ) | × | 3 10 |
| ( | 1 | ÷ | x | ) | × | 1 2 | + | ( | 1 | ÷ | 10 | ) | × | 1 2 | = | ( | 1 | ÷ | x | ) | × | 3 10 | + | ( | 1 | ÷ | 30 | ) | × | 3 10 |
| 1 | ÷ | x | × | 1 2 | + | ( | 1 | ÷ | 10 | ) | × | 1 2 | = | ( | 1 | ÷ | x | ) | × | 3 10 | + | ( | 1 | ÷ | 30 | ) | × | 3 10 |
| 1 | ÷ | x | × | 1 2 | + | ( | 1 | ÷ | 10 | ) | × | 1 2 | = | 1 | ÷ | x | × | 3 10 | + | ( | 1 | ÷ | 30 | ) | × | 3 10 |
1 2 | ÷ | x | + | ( | 1 | ÷ | 10 | ) | × | 1 2 | = | 3 10 | ÷ | x | + | ( | 1 | ÷ | 30 | ) | × | 3 10 |
| Multiply both sides of the equation by: | x |
1 2 | + | ( | 1 | ÷ | 10 | ) | × | 1 2 | x | = | 3 10 | ÷ | 1 | × | 1 | + | ( | 1 | ÷ | 30 | ) | × | 3 10 | x |
1 2 | + | 1 | ÷ | 10 | × | 1 2 | x | = | 3 10 | ÷ | 1 | × | 1 | + | ( | 1 | ÷ | 30 | ) | × | 3 10 | x |
1 2 | + | 1 | ÷ | 10 | × | 1 2 | x | = | 3 10 | ÷ | 1 | × | 1 | + | 1 | ÷ | 30 | × | 3 10 | x |
1 2 | + | 1 20 | x | = | 3 10 | + | 1 100 | x |
1 20 | x | − | 1 100 | x | = | 3 10 | − | 1 2 |
1 25 | x | = | 3 10 | − | 1 2 |
1 25 | x | = | - | 1 5 |
| x | = | - | 1 5 | ÷ | 1 25 |
| = | - | 1 5 | × | 25 |
| = | - | 1 | × | 5 |
| x | = | - | 5 |