| ( | 290 | − | 50 | x | ) | ( | 8 | + | 4 | x | ) | = | 5000 |
| Left side of the equation = | 290 | ( | 8 | + | 4 | x | ) | − | 50 | x | ( | 8 | + | 4 | x | ) |
| = | 290 | × | 8 | + | 290 | × | 4 | x | − | 50 | x | ( | 8 | + | 4 | x | ) |
| = | 2320 | + | 1160 | x | − | 50 | x | ( | 8 | + | 4 | x | ) |
| = | 2320 | + | 1160 | x | − | 50 | x | × | 8 | − | 50 | x | × | 4 | x |
| = | 2320 | + | 1160 | x | − | 400 | x | − | 200 | x | x |
| = | 2320 | + | 760 | x | − | 200 | x | x |
| 2320 | + | 760 | x | − | 200 | x | x | = | 5000 |