| ( | x | − | 10 | ) | ÷ | 1000 | + | x | ÷ | 2000 | + | ( | x | + | 10 | ) | ÷ | 3000 | = | 21 |
| Left side of the equation = | x | × | 1 1000 | − | 10 | × | 1 1000 | + | 1 2000 | x | + | ( | x | + | 10 | ) | × | 1 3000 |
| = | x | × | 1 1000 | − | 1 100 | + | 1 2000 | x | + | ( | x | + | 10 | ) | × | 1 3000 |
| = | 3 2000 | x | − | 1 100 | + | ( | x | + | 10 | ) | × | 1 3000 |
| = | 3 2000 | x | − | 1 100 | + | x | × | 1 3000 | + | 10 | × | 1 3000 |
| = | 3 2000 | x | − | 1 100 | + | x | × | 1 3000 | + | 1 300 |
| = | 11 6000 | x | − | 1 150 |
11 6000 | x | − | 1 150 | = | 21 |
11 6000 | x | = | 21 | + | 1 150 |
11 6000 | x | = | 3151 150 |
| x | = | 3151 150 | ÷ | 11 6000 |
| = | 3151 150 | × | 6000 11 |
| = | 3151 | × | 40 11 |
| x | = | 126040 11 |
| x | = | 11458.181818 |