| ( | 5000 | − | 1800 | ) | g | − | 5000 | ( | 1 | + | g | ) | × | 8 100 | ( | 1 | − | 50 100 | ) | = | 0 |
| Left side of the equation = | ( | 5000 | − | 1800 | ) | g | − | 400 | ( | 1 | + | g | ) | ( | 1 | − | 50 100 | ) |
| ( | 5000 | − | 1800 | ) | g | − | 400 | ( | 1 | + | g | ) | ( | 1 | − | 50 100 | ) | = | 0 |
| Left side of the equation = | 5000 | g | − | 1800 | g | − | 400 | ( | 1 | + | g | ) | ( | 1 | − | 50 100 | ) |
| = | 3200 | g | − | 400 | ( | 1 | + | g | ) | ( | 1 | − | 50 100 | ) |
| = | 3200 | g | − | 400 | × | 1 | ( | 1 | − | 50 100 | ) | − | 400 | g | ( | 1 | − | 50 100 | ) |
| = | 3200 | g | − | 400 | ( | 1 | − | 50 100 | ) | − | 400 | g | ( | 1 | − | 50 100 | ) |
| = | 3200 | g | − | 400 | × | 1 | + | 400 | × | 50 100 | − | 400 | g | ( | 1 | − | 50 100 | ) |
| = | 3200 | g | − | 400 | + | 200 | − | 400 | g | ( | 1 | − | 50 100 | ) |
| = | 3200 | g | − | 200 | − | 400 | g | ( | 1 | − | 50 100 | ) |
| = | 3200 | g | − | 200 | − | 400 | g | × | 1 | + | 400 | g | × | 50 100 |
| = | 3200 | g | − | 200 | − | 400 | g | + | 200 | g |
| = | 3000 | g | − | 200 |
| 3000 | g | − | 200 | = | 0 |
| 3000 | g | = | 0 | + | 200 |
| 3000 | g | = | 200 |
| g | = | 200 | ÷ | 3000 |
| = | 200 | × | 1 3000 |
| = | 1 | × | 1 15 |
| g | = | 1 15 |
| g | = | 0.066667 |