| ( | 10 | + | x | ) | ( | 600 | − | 20 | x | ) | − | 3 2 | ( | 600 | − | 20 | x | ) | − | 300 | − | 1 10 | ( | 10 | + | x | ) | ( | 600 | − | 2 | x | ) | = | 6000 |
| Left side of the equation = | 10 | ( | 600 | − | 20 | x | ) | + | x | ( | 600 | − | 20 | x | ) | − | 3 2 | ( | 600 | − | 20 | x | ) | − | 300 | − | 1 10 | ( | 10 | + | x | ) | ( | 600 | − | 2 | x | ) |
| = | 10 | × | 600 | − | 10 | × | 20 | x | + | x | ( | 600 | − | 20 | x | ) | − | 3 2 | ( | 600 | − | 20 | x | ) | − | 300 | − | 1 10 | ( | 10 | + | x | ) |
| = | 6000 | − | 200 | x | + | x | ( | 600 | − | 20 | x | ) | − | 3 2 | ( | 600 | − | 20 | x | ) | − | 300 | − | 1 10 | ( | 10 | + | x | ) | ( | 600 | − | 2 | x | ) |
| = | 5700 | − | 200 | x | + | x | ( | 600 | − | 20 | x | ) | − | 3 2 | ( | 600 | − | 20 | x | ) | − | 1 10 | ( | 10 | + | x | ) | ( | 600 | − | 2 | x | ) |
| = | 5700 | − | 200 | x | + | x | × | 600 | − | x | × | 20 | x | − | 3 2 | ( | 600 | − | 20 | x | ) | − | 1 10 | ( | 10 | + | x | ) |
| = | 5700 | + | 400 | x | − | x | × | 20 | x | − | 3 2 | ( | 600 | − | 20 | x | ) | − | 1 10 | ( | 10 | + | x | ) | ( | 600 | − | 2 | x | ) |
| = | 5700 | + | 400 | x | − | x | × | 20 | x | − | 3 2 | × | 600 | + | 3 2 | × | 20 | x | − | 1 10 |
| = | 5700 | + | 400 | x | − | x | × | 20 | x | − | 900 | + | 30 | x | − | 1 10 | ( | 10 | + | x | ) | ( | 600 | − | 2 | x | ) |
| = | 4800 | + | 430 | x | − | x | × | 20 | x | − | 1 10 | ( | 10 | + | x | ) | ( | 600 | − | 2 | x | ) |
| = | 4800 | + | 430 | x | − | x | × | 20 | x | − | 1 10 | × | 10 | ( | 600 | − | 2 | x | ) | − | 1 10 | x | ( | 600 | − | 2 | x | ) |
| = | 4800 | + | 430 | x | − | x | × | 20 | x | − | 1 | ( | 600 | − | 2 | x | ) | − | 1 10 | x | ( | 600 | − | 2 | x | ) |
| = | 4800 | + | 430 | x | − | x | × | 20 | x | − | 1 | × | 600 | + | 1 | × | 2 | x | − | 1 10 |
| = | 4800 | + | 430 | x | − | x | × | 20 | x | − | 600 | + | 2 | x | − | 1 10 | x | ( | 600 | − | 2 | x | ) |
| = | 4200 | + | 432 | x | − | x | × | 20 | x | − | 1 10 | x | ( | 600 | − | 2 | x | ) |
| = | 4200 | + | 432 | x | − | x | × | 20 | x | − | 1 10 | x | × | 600 | + | 1 10 | x | × | 2 |
| = | 4200 | + | 432 | x | − | x | × | 20 | x | − | 60 | x | + | 1 5 | x | x |
| = | 4200 | + | 372 | x | − | x | × | 20 | x | + | 1 5 | x | x |
| 4200 | + | 372 | x | − | x | × | 20 | x | + | 1 5 | x | x | = | 6000 |