| ( | ( | 1 | + | X | ) | ÷ | X | ) | × | 315 100 | = | 121 200 |
| ( | 1 | + | X | ) | ÷ | X | × | 315 100 | = | 121 200 |
| Multiply both sides of the equation by: | X |
| ( | 1 | + | X | ) | × | 315 100 | = | 121 200 | X |
| 1 | × | 315 100 | + | X | × | 315 100 | = | 121 200 | X |
63 20 | + | X | × | 315 100 | = | 121 200 | X |
315 100 | X | − | 121 200 | X | = | - | 63 20 |
509 200 | X | = | - | 63 20 |
| X | = | - | 63 20 | ÷ | 509 200 |
| = | - | 63 20 | × | 200 509 |
| = | - | 63 | × | 10 509 |
| X | = | - | 630 509 |
| X | = | - 1.237721 |