| ( | ( | 1000 | ( | 1 | + | X | ) | − | 200 | ) | ( | 1 | + | X | ) | − | 500 | ) | ( | 1 | + | X | ) | − | 600 | = | 0 |
| Left side of the equation = | ( | 1000 | ( | 1 | + | X | ) | − | 200 | ) | ( | 1 | + | X | ) | ( | 1 | + | X | ) | − | 500 | ( | 1 | + | X | ) | − | 600 |
| = | 1000 | ( | 1 | + | X | ) | ( | 1 | + | X | ) | ( | 1 | + | X | ) | − | 200 | ( | 1 | + | X | ) | ( | 1 | + | X | ) | − | 500 | ( | 1 | + | X | ) | − | 600 |
| = | 1000 | × | 1 | ( | 1 | + | X | ) | ( | 1 | + | X | ) | + | 1000 | X | ( | 1 | + | X | ) | ( | 1 | + | X | ) | − | 200 | ( | 1 | + | X | ) | ( | 1 | + | X | ) | − | 500 |
| = | 1000 | ( | 1 | + | X | ) | ( | 1 | + | X | ) | + | 1000 | X | ( | 1 | + | X | ) | ( | 1 | + | X | ) | − | 200 | ( | 1 | + | X | ) | ( | 1 | + | X | ) | − | 500 | ( | 1 | + | X | ) |
| = | 1000 | × | 1 | ( | 1 | + | X | ) | + | 1000 | X | ( | 1 | + | X | ) | + | 1000 | X | ( | 1 | + | X | ) | ( | 1 | + | X | ) | − | 200 | ( | 1 | + | X | ) |
| = | 1000 | ( | 1 | + | X | ) | + | 1000 | X | ( | 1 | + | X | ) | + | 1000 | X | ( | 1 | + | X | ) | ( | 1 | + | X | ) | − | 200 | ( | 1 | + | X | ) | ( | 1 | + | X | ) |
| = | 1000 | × | 1 | + | 1000 | X | + | 1000 | X | ( | 1 | + | X | ) | + | 1000 | X | ( | 1 | + | X | ) | ( | 1 | + | X | ) | − | 200 |
| = | 1000 | + | 1000 | X | + | 1000 | X | ( | 1 | + | X | ) | + | 1000 | X | ( | 1 | + | X | ) | ( | 1 | + | X | ) | − | 200 | ( | 1 | + | X | ) |
| = | 400 | + | 1000 | X | + | 1000 | X | ( | 1 | + | X | ) | + | 1000 | X | ( | 1 | + | X | ) | ( | 1 | + | X | ) | − | 200 | ( | 1 | + | X | ) |
| = | 400 | + | 1000 | X | + | 1000 | X | × | 1 | + | 1000 | X | X | + | 1000 | X | ( | 1 | + | X | ) |
| = | 400 | + | 1000 | X | + | 1000 | X | + | 1000 | X | X | + | 1000 | X | ( | 1 | + | X | ) | ( | 1 | + | X | ) |
| = | 400 | + | 2000 | X | + | 1000 | X | X | + | 1000 | X | ( | 1 | + | X | ) | ( | 1 | + | X | ) | − | 200 | ( | 1 | + | X | ) |
| = | 400 | + | 2000 | X | + | 1000 | X | X | + | 1000 | X | × | 1 | ( | 1 | + | X | ) | + | 1000 | X |
| = | 400 | + | 2000 | X | + | 1000 | X | X | + | 1000 | X | ( | 1 | + | X | ) | + | 1000 | X | X |
| = | 400 | + | 2000 | X | + | 1000 | X | X | + | 1000 | X | × | 1 | + | 1000 | X | X |
| = | 400 | + | 2000 | X | + | 1000 | X | X | + | 1000 | X | + | 1000 | X | X | + | 1000 |
| = | 400 | + | 3000 | X | + | 1000 | X | X | + | 1000 | X | X | + | 1000 | X | X |
| = | 400 | + | 3000 | X | + | 1000 | X | X | + | 1000 | X | X | + | 1000 | X | X |
| = | 400 | + | 3000 | X | + | 1000 | X | X | + | 1000 | X | X | + | 1000 | X | X |
| = | 400 | + | 3000 | X | + | 1000 | X | X | + | 1000 | X | X | + | 1000 | X | X |
| = | 400 | + | 3000 | X | + | 1000 | X | X | + | 1000 | X | X | + | 1000 | X | X |
| = | 400 | + | 3000 | X | + | 1000 | X | X | + | 1000 | X | X | + | 1000 | X | X |
| = | 400 | + | 3000 | X | + | 1000 | X | X | + | 1000 | X | X | + | 1000 | X | X |
| = | 200 | + | 2800 | X | + | 1000 | X | X | + | 1000 | X | X | + | 1000 | X | X |
| = | 200 | + | 2800 | X | + | 1000 | X | X | + | 1000 | X | X | + | 1000 | X | X |