| 2200 | ( | 1 | + | 4 | x | ) | × | 50 | ( | 1 | + | x | ) | + | 200 | × | 650 | = | 240000 | ( | 1 | + | 7 | ÷ | 2 | × | x | ) |
| Left side of the equation = | 110000 | ( | 1 | + | 4 | x | ) | ( | 1 | + | x | ) | + | 130000 |
| 110000 | ( | 1 | + | 4 | x | ) | ( | 1 | + | x | ) | + | 130000 | = | 240000 | ( | 1 | + | 7 | ÷ | 2 | × | x | ) |
| Left side of the equation = | 110000 | × | 1 | ( | 1 | + | x | ) | + | 110000 | × | 4 | x | ( | 1 | + | x | ) | + | 130000 |
| = | 110000 | ( | 1 | + | x | ) | + | 440000 | x | ( | 1 | + | x | ) | + | 130000 |
| = | 110000 | × | 1 | + | 110000 | x | + | 440000 | x | ( | 1 | + | x | ) | + | 130000 |
| = | 110000 | + | 110000 | x | + | 440000 | x | ( | 1 | + | x | ) | + | 130000 |
| = | 240000 | + | 110000 | x | + | 440000 | x | ( | 1 | + | x | ) |
| = | 240000 | + | 110000 | x | + | 440000 | x | × | 1 | + | 440000 | x | x |
| = | 240000 | + | 110000 | x | + | 440000 | x | + | 440000 | x | x |
| = | 240000 | + | 550000 | x | + | 440000 | x | x |
| 240000 | + | 550000 | x | + | 440000 | x | x | = | 240000 | ( | 1 | + | 7 | ÷ | 2 | × | x | ) |
| Right side of the equation = | 240000 | × | 1 | + | 240000 | × | 7 | ÷ | 2 | × | x |
| = | 240000 | + | 840000 | x |
| 240000 | + | 550000 | x | + | 440000 | x | x | = | 240000 | + | 840000 | x |
| x2= | 29 44 |