| 0 | = | 900 | x | − | 120 | x | − | ( | 12000000 | + | 560 | x | ) |
| Right side of the equation = | 780 | x | − | ( | 12000000 | + | 560 | x | ) |
| 0 | = | 780 | x | − | ( | 12000000 | + | 560 | x | ) |
| Right side of the equation = | 780 | x | − | 12000000 | − | 560 | x |
| = | 220 | x | − | 12000000 |
| 0 | = | 220 | x | − | 12000000 |
| - | 220 | x | = | - | 12000000 | − | 0 |
| - | 220 | x | = | - | 12000000 |
| 12000000 | = | 220 | x |
| 220 | x | = | 12000000 |
| x | = | 12000000 | ÷ | 220 |
| = | 12000000 | × | 1 220 |
| = | 600000 | × | 1 11 |
| x | = | 600000 11 |
| x | = | 54545.454545 |