| 0 | = | 3 5 | + | 3 20 | ( | ( | 1 | + | x | ) | ÷ | x | ) | × | 1 20 | × | 1 |
| 0 | = | 3 5 | + | 3 20 | ( | 1 | + | x | ) | ÷ | x | × | 1 20 | × | 1 |
| 0 | = | 3 5 | + | 3 400 | ( | 1 | + | x | ) | ÷ | x |
| Multiply both sides of the equation by: | x |
| 0 | = | 3 5 | x | + | 3 400 | ( | 1 | + | x | ) |
| 0 | = | 3 5 | x | + | 3 400 | × | 1 | + | 3 400 | x |
| 0 | = | 3 5 | x | + | 3 400 | + | 3 400 | x |
| 0 | = | 243 400 | x | + | 3 400 |
| - | 243 400 | x | = | 3 400 | − | 0 |
| - | 243 400 | x | = | 3 400 |
| - | 3 400 | = | 243 400 | x |
243 400 | x | = | - | 3 400 |
| x | = | - | 3 400 | ÷ | 243 400 |
| = | - | 3 400 | × | 400 243 |
| = | - | 1 | × | 1 81 |
| x | = | - | 1 81 |
| x | = | - 0.012346 |