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[tex]3\frac{1}{8}+\frac{5}{7}=\frac{25}{8}+\frac{5}{7}=\frac{175+40}{56}=\frac{215}{56} \\ \\\frac{12}{7}+\frac{3}{4}=\frac{48+21}{28}=\frac{69}{28} \\ \\5\frac{3}{7}+\frac{4}{9}=\frac{38}{7}+\frac{4}{9}=\frac{342+28}{63}=\frac{370}{28}[/tex]

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