| ( | 393 100 | x | + | 1610 | ) | ÷ | ( | x | + | 1400 | ) | = | 0 |
| Multiply both sides of the equation by: | ( | x | + | 1400 | ) |
| ( | 393 100 | x | + | 1610 | ) | = | 0 |
393 100 | x | + | 1610 | = | 0 |
393 100 | x | = | 0 | − | 1610 |
393 100 | x | = | - | 1610 |
| x | = | - | 1610 | ÷ | 393 100 |
| = | - | 1610 | × | 100 393 |
| x | = | - | 161000 393 |
| x | = | - 409.669211 |