| ( | 3 | ÷ | 4 | × | x | − | 1200 | ) | ÷ | 3000 | = | ( | 3 | ÷ | 4 | × | x | − | 1500 | ) | ÷ | 4000 |
| Left side of the equation = | 3 | ÷ | 4 | × | x | × | 1 3000 | − | 1200 | × | 1 3000 |
| = | 1 4000 | x | − | 2 5 |
1 4000 | x | − | 2 5 | = | ( | 3 | ÷ | 4 | × | x | − | 1500 | ) | ÷ | 4000 |
| Right side of the equation = | 3 | ÷ | 4 | × | x | × | 1 4000 | − | 1500 | × | 1 4000 |
| = | 3 16000 | x | − | 3 8 |
1 4000 | x | − | 2 5 | = | 3 16000 | x | − | 3 8 |
1 4000 | x | − | 3 16000 | x | = | - | 3 8 | + | 2 5 |
1 16000 | x | = | - | 3 8 | + | 2 5 |
1 16000 | x | = | 1 40 |
| x | = | 1 40 | ÷ | 1 16000 |
| = | 1 40 | × | 16000 |
| = | 1 | × | 400 |
| x | = | 400 |