| 30 | + | 1 5 | ( | x | − | 320 | ) | = | 50 | + | 1 10 | ( | x | − | 550 | ) |
| Left side of the equation = | 30 | + | 1 5 | x | − | 1 5 | × | 320 |
| = | 30 | + | 1 5 | x | − | 64 |
| = | - | 34 | + | 1 5 | x |
| - | 34 | + | 1 5 | x | = | 50 | + | 1 10 | ( | x | − | 550 | ) |
| Right side of the equation = | 50 | + | 1 10 | x | − | 1 10 | × | 550 |
| = | 50 | + | 1 10 | x | − | 55 |
| = | - | 5 | + | 1 10 | x |
| - | 34 | + | 1 5 | x | = | - | 5 | + | 1 10 | x |
1 5 | x | − | 1 10 | x | = | - | 5 | + | 34 |
1 10 | x | = | - | 5 | + | 34 |
1 10 | x | = | 29 |
| x | = | 29 | ÷ | 1 10 |
| = | 29 | × | 10 |
| x | = | 290 |