$-\frac{1}{2}-\frac{3}{1}=$

Step 1 ：Find a common denominator for the fractions: \(-\frac{1}{2}\) and \(-\frac{3}{1}\). The common denominator is 2.

Step 2 ：Convert both fractions to have the same denominator and add them: \(-\frac{1}{2} - \frac{6}{2} = -\frac{7}{2}\).

Step 3 ：The simplified final answer is: \(\boxed{-\frac{7}{2}}\)