| 3 | ( | x | + | 100 | ) | ÷ | 100 | + | 9 | x | ÷ | 250 | = | 36 |
| Left side of the equation = | 3 100 | ( | x | + | 100 | ) | + | 9 250 | x |
3 100 | ( | x | + | 100 | ) | + | 9 250 | x | = | 36 |
| Left side of the equation = | 3 100 | x | + | 3 100 | × | 100 | + | 9 250 | x |
| = | 3 100 | x | + | 3 | + | 9 250 | x |
| = | 33 500 | x | + | 3 |
33 500 | x | + | 3 | = | 36 |
33 500 | x | = | 36 | − | 3 |
33 500 | x | = | 33 |
| x | = | 33 | ÷ | 33 500 |
| = | 33 | × | 500 33 |
| = | 1 | × | 500 |
| x | = | 500 |