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Answer:
[tex] \frac{7}{11} = \frac{7}{11} [/tex]
Step-by-step explanation:
[tex] \frac{2}{11} + ( \frac{4}{11} + \frac{1}{11} ) = ( \frac{2}{11} + \frac{4}{11} ) + \frac{1}{11} \\ \frac{2}{11} + \frac{5}{11} = \frac{6}{11} + \frac{1}{11} \\ \frac{7}{11} = \frac{7}{11} \\ [/tex]