To subtract the fractions \( \frac{7}{8} - \frac{3}{4} \), we first need to rewrite \( \frac{3}{4} \) with a common denominator of 8.
Since \( \frac{3}{4} = \frac{3 \times 2}{4 \times 2} = \frac{6}{8} \), we can now perform the subtraction:
\[ \frac{7}{8} - \frac{6}{8} = \frac{7 - 6}{8} = \frac{1}{8} \]
Thus, the answer in simplest form is \( \frac{1}{8} \).
So, the answer is:
\[ 1/8 \]