| 1400 | ÷ | ( | 1 | + | X | ) | = | 1050 |
| Multiply both sides of the equation by: | ( | 1 | + | X | ) |
| 1400 | = | 1050 | ( | 1 | + | X | ) |
| 1400 | = | 1050 | × | 1 | + | 1050 | X |
| 1400 | = | 1050 | + | 1050 | X |
| - | 1050 | X | = | 1050 | − | 1400 |
| - | 1050 | X | = | - | 350 |
| 350 | = | 1050 | X |
| 1050 | X | = | 350 |
| X | = | 350 | ÷ | 1050 |
| = | 350 | × | 1 1050 |
| = | 1 | × | 1 3 |
| X | = | 1 3 |
| X | = | 0.333333 |