| x | − | x | ÷ | 21 20 | × | 5 100 | × | 28 25 | − | x | ÷ | 21 20 | × | 1 2000 | − | ( | x | − | x | ÷ | 21 20 | × | 5 100 | × | 28 25 | − | x | ÷ | 21 20 | × | 1 2000 | − | 4500 | ) | × | 30 100 | = | 4500 |
| Left side of the equation = | x | − | x | × | 4 75 | − | x | × | 1 2100 | − | ( | x | − | x | ÷ | 21 20 | × | 5 100 | × | 28 25 | − | x | ÷ | 21 20 | × | 1 2000 | − | 4500 | ) | × | 30 100 |
| = | 1987 2100 | x | − | ( | x | − | x | ÷ | 21 20 | × | 5 100 | × | 28 25 | − | x | ÷ | 21 20 | × | 1 2000 | − | 4500 | ) | × | 30 100 |
1987 2100 | x | − | ( | x | − | x | ÷ | 21 20 | × | 5 100 | × | 28 25 | − | x | ÷ | 21 20 | × | 1 2000 | − | 4500 | ) | × | 30 100 | = | 4500 |
| Left side of the equation = | 1987 2100 | x | − | x | × | 30 100 | + | x | ÷ | 21 20 | × | 5 100 | × | 28 25 | × | 30 100 | + | x | ÷ | 21 20 | × | 1 2000 |
| = | 1987 2100 | x | − | x | × | 30 100 | + | x | × | 2 125 | + | x | × | 1 7000 | + | 1350 |
| = | 1987 3000 | x | + | 1350 |
1987 3000 | x | + | 1350 | = | 4500 |
1987 3000 | x | = | 4500 | − | 1350 |
1987 3000 | x | = | 3150 |
| x | = | 3150 | ÷ | 1987 3000 |
| = | 3150 | × | 3000 1987 |
| x | = | 9450000 1987 |
| x | = | 4755.913437 |