33 10 | ( | 80 | + | x | ) | = | 602 | − | 140 |
| Left side of the equation = | 33 10 | × | 80 | + | 33 10 | x |
| = | 264 | + | 33 10 | x |
| 264 | + | 33 10 | x | = | 602 | − | 140 |
| Right side of the equation = | 462 |
| 264 | + | 33 10 | x | = | 462 |
33 10 | x | = | 462 | − | 264 |
33 10 | x | = | 198 |
| x | = | 198 | ÷ | 33 10 |
| = | 198 | × | 10 33 |
| = | 6 | × | 10 |
| x | = | 60 |