16 5 | x | + | 120 | × | 7 2 | + | 16 5 | ( | 400 | − | x | − | 120 | ) | = | 1336 |
| Left side of the equation = | 16 5 | x | + | 420 | + | 16 5 | ( | 400 | − | x | − | 120 | ) |
16 5 | x | + | 420 | + | 16 5 | ( | 400 | − | x | − | 120 | ) | = | 1336 |
| Left side of the equation = | 16 5 | x | + | 420 | + | 16 5 | × | 400 | − | 16 5 | x | − | 16 5 | × | 120 |
| = | 16 5 | x | + | 420 | + | 1280 | − | 16 5 | x | − | 384 |
| = | 0 | x | + | 1316 |
| 0 | x | + | 1316 | = | 1336 |
| = | 1336 | − | 1316 |