[tex]-\frac{1}{2} -(-\frac{3}{4} )\\\\= -\frac{1}{2} +\frac{3}{4} \\\\= \frac{-2+3}{4} \\\\= \boxed {\frac{1}{4} }[/tex]

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Verified answer

[tex] \frac{1}{ - 2} - (\frac{ - 3}{4}) \\ → - \frac{1}{2} + \frac{3}{4} \\ → \frac{ - 2 + 3}{4} \\ →\frac{1}{4} \\