| ( | ( | 2500 | − | x | ) | × | 7 20 | + | 450 | ) | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) | = | x |
| Left side of the equation = | ( | 2500 | − | x | ) | × | 7 20 | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) | + | 450 | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) |
| = | 2500 | × | 7 20 | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) | − | x | × | 7 20 | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) | + | 450 | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) |
| = | 875 | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) | − | x | × | 7 20 | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) | + | 450 | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) |
| = | 875 | × | 1 | + | 875 | × | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | − | x | × | 7 20 | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) | + | 450 | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) |
| = | 875 | + | 1 10 | ( | 2500 | − | x | ) | − | x | × | 7 20 | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) | + | 450 | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) |
| = | 875 | + | 1 10 | × | 2500 | − | 1 10 | x | − | x | × | 7 20 | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) | + | 450 | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) |
| = | 875 | + | 250 | − | 1 10 | x | − | x | × | 7 20 | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) | + | 450 | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) |
| = | 1125 | − | 1 10 | x | − | x | × | 7 20 | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) | + | 450 | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) |
| = | 1125 | − | 1 10 | x | − | x | × | 7 20 | × | 1 | − | x | × | 7 20 | × | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | + | 450 |
| = | 1125 | − | 1 10 | x | − | x | × | 7 20 | − | x | × | 1 25000 | ( | 2500 | − | x | ) | + | 450 | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) |
| = | 1125 | − | 9 20 | x | − | x | × | 1 25000 | ( | 2500 | − | x | ) | + | 450 | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) |
| = | 1125 | − | 9 20 | x | − | x | × | 1 25000 | × | 2500 | + | x | × | 1 25000 | x | + | 450 | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) |
| = | 1125 | − | 9 20 | x | − | x | × | 1 10 | + | x | × | 1 25000 | x | + | 450 | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) |
| = | 1125 | − | 11 20 | x | + | x | × | 1 25000 | x | + | 450 | ( | 1 | + | 2 | ( | 2500 | − | x | ) | ÷ | 17500 | ) |
| = | 1125 | − | 11 20 | x | + | x | × | 1 25000 | x | + | 450 | × | 1 | + | 450 | × | 2 | ( | 2500 | − | x | ) | ÷ | 17500 |
| = | 1125 | − | 11 20 | x | + | x | × | 1 25000 | x | + | 450 | + | 9 175 | ( | 2500 | − | x | ) |
| = | 1575 | − | 11 20 | x | + | x | × | 1 25000 | x | + | 9 175 | ( | 2500 | − | x | ) |
| = | 1575 | − | 11 20 | x | + | x | × | 1 25000 | x | + | 9 175 | × | 2500 | − | 9 175 | x |
| = | 1575 | − | 11 20 | x | + | x | × | 1 25000 | x | + | 900 7 | − | 9 175 | x |
| = | 11925 7 | − | 421 700 | x | + | x | × | 1 25000 | x |
11925 7 | − | 421 700 | x | + | x | × | 1 25000 | x | = | x |