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[tex]2 \frac{1}{2} + \frac{1}{3} = 2 + ( \frac{3 + 2}{6}) = 2 \frac{5}{6} [/tex]
[tex]2 \frac{5}{6} - 1 \frac{3}{4} = 2 - 1 + ( \frac{20 - 18}{24} ) = 1 \frac{2}{24}= 1 \frac{1}{12} [/tex]
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