| 300 | ( | n | + | 5400 | ) | n | ÷ | 2 | + | 1500 | n | = | 97000 |
| Left side of the equation = | 150 | ( | n | + | 5400 | ) | n | + | 1500 | n |
| 150 | ( | n | + | 5400 | ) | n | + | 1500 | n | = | 97000 |
| Left side of the equation = | 150 | n | n | + | 150 | × | 5400 | n | + | 1500 | n |
| = | 150 | n | n | + | 810000 | n | + | 1500 | n |
| = | 150 | n | n | + | 811500 | n |
| 150 | n | n | + | 811500 | n | = | 97000 |