| ( | x | + | 18 | + | 81 2 | ) | ÷ | 1500 | = | 12 100 |
| Left side of the equation = | x | × | 1 1500 | + | 18 | × | 1 1500 | + | 81 2 | × | 1 1500 |
| = | x | × | 1 1500 | + | 3 250 | + | 27 1000 |
| = | 1 1500 | x | + | 39 1000 |
1 1500 | x | + | 39 1000 | = | 12 100 |
1 1500 | x | = | 12 100 | − | 39 1000 |
1 1500 | x | = | 81 1000 |
| x | = | 81 1000 | ÷ | 1 1500 |
| = | 81 1000 | × | 1500 |
| = | 81 2 | × | 3 |
| x | = | 243 2 |
| x | = | 121.5 |