| 1000 | = | ( | 15000 | + | ( | m | − | 500000 | ) | × | 3 200 | ) | × | 1 5 |
| Right side of the equation = | 15000 | × | 1 5 | + | ( | m | − | 500000 | ) | × | 3 200 | × | 1 5 |
| = | 3000 | + | ( | m | − | 500000 | ) | × | 3 1000 |
| = | 3000 | + | m | × | 3 1000 | − | 500000 | × | 3 1000 |
| = | 3000 | + | m | × | 3 1000 | − | 1500 |
| = | 1500 | + | 3 1000 | m |
| 1000 | = | 1500 | + | 3 1000 | m |
| - | 3 1000 | m | = | 1500 | − | 1000 |
| - | 3 1000 | m | = | 500 |
| - | 500 | = | 3 1000 | m |
3 1000 | m | = | - | 500 |
| m | = | - | 500 | ÷ | 3 1000 |
| = | - | 500 | × | 1000 3 |
| m | = | - | 500000 3 |
| m | = | - 166666.666667 |