| ( | x | ÷ | 750 | × | 100 | ) | × | 60 100 | + | ( | 243 | ÷ | 300 | × | 100 | ) | × | 40 100 | = | 621 2 |
| Left side of the equation = | x | ÷ | 750 | × | 100 | × | 60 100 | + | ( | 243 | ÷ | 300 | × | 100 | ) | × | 40 100 |
| = | x | × | 2 25 | + | ( | 243 | ÷ | 300 | × | 100 | ) | × | 40 100 |
| = | 2 25 | x | + | 243 | ÷ | 300 | × | 100 | × | 40 100 |
| = | 2 25 | x | + | 162 5 |
2 25 | x | + | 162 5 | = | 621 2 |
2 25 | x | = | 621 2 | − | 162 5 |
2 25 | x | = | 2781 10 |
| x | = | 2781 10 | ÷ | 2 25 |
| = | 2781 10 | × | 25 2 |
| = | 2781 2 | × | 5 2 |
| x | = | 13905 4 |
| x | = | 3476.25 |