Answer
$\frac{1}{4}$
Work Step by Step
$-\frac{1}{2}-(-\frac{3}{4})=-\frac{1}{2}+\frac{3}{4}=\frac{3}{4}-\frac{1}{2}=\frac{3}{4}-\frac{1\times2}{2\times2}=\frac{3}{4}-\frac{2}{4}=\frac{3-2}{4}=\frac{1}{4}$
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