| ( | 360 | − | x | ) | ( | 2 | ( | 480 | − | x | ) | + | 160 | ) | = | 0 |
| Left side of the equation = | 360 | ( | 2 | ( | 480 | − | x | ) | + | 160 | ) | − | x | ( | 2 | ( | 480 | − | x | ) | + | 160 | ) |
| = | 360 | × | 2 | ( | 480 | − | x | ) | + | 360 | × | 160 | − | x | ( | 2 | ( | 480 | − | x | ) | + | 160 | ) |
| = | 720 | ( | 480 | − | x | ) | + | 57600 | − | x | ( | 2 | ( | 480 | − | x | ) | + | 160 | ) |
| = | 720 | × | 480 | − | 720 | x | + | 57600 | − | x | ( | 2 | ( | 480 | − | x | ) | + | 160 | ) |
| = | 345600 | − | 720 | x | + | 57600 | − | x | ( | 2 | ( | 480 | − | x | ) | + | 160 | ) |
| = | 403200 | − | 720 | x | − | x | ( | 2 | ( | 480 | − | x | ) | + | 160 | ) |
| = | 403200 | − | 720 | x | − | x | × | 2 | ( | 480 | − | x | ) | − | x | × | 160 |
| = | 403200 | − | 880 | x | − | x | × | 2 | ( | 480 | − | x | ) |
| = | 403200 | − | 880 | x | − | x | × | 2 | × | 480 | + | x | × | 2 | x |
| = | 403200 | − | 880 | x | − | x | × | 960 | + | x | × | 2 | x |
| = | 403200 | − | 1840 | x | + | x | × | 2 | x |
| 403200 | − | 1840 | x | + | x | × | 2 | x | = | 0 |