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[tex] \bf \frac{1}{3} \times \big( \frac{2}{7} + 1 ) = \\ \\ \bf = \frac{1}{3} \times \frac{2 + 7}{7} = \\ \\ \bf = \frac{1}{\not 3} \times \frac{\not 9}{7} = \\ \\ \bf \red{\boxed{= \frac{3}{7}}} [/tex]
