[tex]\begin{aligned} \sf \frac{2}{3} + \frac{7}{9} &= \sf \frac{2 \times 3}{3 \times 3} + \frac{7}{9} \\ \sf &= \sf \frac{6}{9} + \frac{7}{9} \\ \sf &= \sf \frac{6 + 7}{9} \\ \sf &= \sf \red{\frac{13}{9}} \: \sf \: atau \: \red{1 \frac{4}{9}} \end{aligned}[/tex]
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[tex]\begin{aligned} \sf \frac{2}{3} + \frac{7}{9} &= \sf \frac{2 \times 3}{3 \times 3} + \frac{7}{9} \\ \sf &= \sf \frac{6}{9} + \frac{7}{9} \\ \sf &= \sf \frac{6 + 7}{9} \\ \sf &= \sf \red{\frac{13}{9}} \: \sf \: atau \: \red{1 \frac{4}{9}} \end{aligned}[/tex]