| ( | x | + | ( | 70 | − | x | ) | ) | × | 3 | × | 80 100 | = | 183 |
| Left side of the equation = | ( | x | + | ( | 70 | − | x | ) | ) | × | 12 5 |
| ( | x | + | ( | 70 | − | x | ) | ) | × | 12 5 | = | 183 |
| Left side of the equation = | x | × | 12 5 | + | ( | 70 | − | x | ) | × | 12 5 |
| = | 12 5 | x | + | 70 | × | 12 5 | − | x | × | 12 5 |
| = | 12 5 | x | + | 168 | − | x | × | 12 5 |
| = | 0 | x | + | 168 |
| 0 | x | + | 168 | = | 183 |
| = | 183 | − | 168 |