| 2 | + | 2 | ( | 1 | + | x | ) | + | 2 | ( | 1 | + | x | ) | = | 218 25 |
| Left side of the equation = | 2 | + | 2 | × | 1 | + | 2 | x | + | 2 | ( | 1 | + | x | ) |
| = | 2 | + | 2 | + | 2 | x | + | 2 | ( | 1 | + | x | ) |
| = | 4 | + | 2 | x | + | 2 | ( | 1 | + | x | ) |
| = | 4 | + | 2 | x | + | 2 | × | 1 | + | 2 | x |
| = | 4 | + | 2 | x | + | 2 | + | 2 | x |
| = | 6 | + | 4 | x |
| 6 | + | 4 | x | = | 218 25 |
| 4 | x | = | 218 25 | − | 6 |
| 4 | x | = | 68 25 |
| x | = | 68 25 | ÷ | 4 |
| = | 68 25 | × | 1 4 |
| = | 17 25 | × | 1 |
| x | = | 17 25 |
| x | = | 0.68 |