| 10000 | × | 12 | x | + | 6000 | x | − | 6000 | × | 6 | x | − | 7000 | × | 6 | x | = | 600000 | ( | 1 | + | 3 1000 | ) |
| Left side of the equation = | 120000 | x | + | 6000 | x | − | 36000 | x | − | 42000 | x |
| = | 48000 | x |
| 48000 | x | = | 600000 | ( | 1 | + | 3 1000 | ) |
| Right side of the equation = | 600000 | × | 1 | + | 600000 | × | 3 1000 |
| = | 600000 | + | 1800 |
| = | 601800 |
| 48000 | x | = | 601800 |
| x | = | 601800 | ÷ | 48000 |
| = | 601800 | × | 1 48000 |
| = | 1003 | × | 1 80 |
| x | = | 1003 80 |
| x | = | 12.5375 |