| 90 | + | ( | x | − | 180 | ) | × | 3 5 | + | 90 | + | ( | 460 | − | x | − | 180 | ) | × | 3 5 | = | 507 2 |
| Left side of the equation = | 180 | + | ( | x | − | 180 | ) | × | 3 5 | + | ( | 460 | − | x | − | 180 | ) | × | 3 5 |
| 180 | + | ( | x | − | 180 | ) | × | 3 5 | + | ( | 460 | − | x | − | 180 | ) | × | 3 5 | = | 507 2 |
| Left side of the equation = | 180 | + | x | × | 3 5 | − | 180 | × | 3 5 | + | ( | 460 | − | x | − | 180 | ) | × | 3 5 |
| = | 180 | + | x | × | 3 5 | − | 108 | + | ( | 460 | − | x | − | 180 | ) | × | 3 5 |
| = | 72 | + | 3 5 | x | + | ( | 460 | − | x | − | 180 | ) | × | 3 5 |
| = | 72 | + | 3 5 | x | + | 460 | × | 3 5 | − | x | × | 3 5 | − | 180 | × | 3 5 |
| = | 72 | + | 3 5 | x | + | 276 | − | x | × | 3 5 | − | 108 |
| = | 240 | + | 0 | x |
| 240 | + | 0 | x | = | 507 2 |
| = | 507 2 | − | 240 |