Fractions must share a common denominator in order to be added or subtracted. The common denominator is the least common multiple of all the denominators.
What is \( \frac{2}{5} \) - \( \frac{9}{7} \)?
| 1 \( \frac{2}{7} \) | |
| 1 \( \frac{6}{35} \) | |
| 2 \( \frac{6}{35} \) | |
| -\(\frac{31}{35}\) |