| 100 | ( | 1 | + | x | ) | × | 2 | = | 436 |
| Left side of the equation = | 200 | ( | 1 | + | x | ) |
| 200 | ( | 1 | + | x | ) | = | 436 |
| Left side of the equation = | 200 | × | 1 | + | 200 | x |
| = | 200 | + | 200 | x |
| 200 | + | 200 | x | = | 436 |
| 200 | x | = | 436 | − | 200 |
| 200 | x | = | 236 |
| x | = | 236 | ÷ | 200 |
| = | 236 | × | 1 200 |
| = | 59 | × | 1 50 |
| x | = | 59 50 |
| x | = | 1.18 |