| ( | 300 | × | 2 25 | ) | ÷ | 300 | + | x | = | ( | 120 | × | 1 8 | ) | ÷ | 120 | + | x |
| Left side of the equation = | 300 | × | 2 25 | × | 1 300 | + | x |
| = | 2 25 | + | x |
2 25 | + | x | = | ( | 120 | × | 1 8 | ) | ÷ | 120 | + | x |
| Right side of the equation = | 120 | × | 1 8 | × | 1 120 | + | x |
| = | 1 8 | + | x |
2 25 | + | x | = | 1 8 | + | x |
| x | − | x | = | 1 8 | − | 2 25 |
| 0 | x | = | 1 8 | − | 2 25 |
| 0 | x | = | 9 200 |