199 10 | x | − | 2600 | − | 12 | ( | x | − | 10 | ) | = | 1500 |
| Left side of the equation = | 199 10 | x | − | 2600 | − | 12 | x | + | 12 | × | 10 |
| = | 199 10 | x | − | 2600 | − | 12 | x | + | 120 |
| = | 79 10 | x | − | 2480 |
79 10 | x | − | 2480 | = | 1500 |
79 10 | x | = | 1500 | + | 2480 |
79 10 | x | = | 3980 |
| x | = | 3980 | ÷ | 79 10 |
| = | 3980 | × | 10 79 |
| x | = | 39800 79 |
| x | = | 503.797468 |