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