To subtract the fractions \( \frac{2}{7p^2} - \frac{3}{p} \), we need a common denominator. The least common denominator (LCD) for \( 7p^2 \) and \( p \) is \( 7p^2 \).
Now we can rewrite the second fraction with the common denominator:
\[ \frac{3}{p} = \frac{3 \cdot 7p}{p \cdot 7} = \frac{21p}{7p^2} \]
Now, we can perform the subtraction:
\[ \frac{2}{7p^2} - \frac{21p}{7p^2} = \frac{2 - 21p}{7p^2} \]
Thus, the expression simplifies to:
\[ \frac{2 - 21p}{7p^2} \]
This is the answer in its lowest terms.