[tex]a* \frac{2}{3} * \frac{14}{13} = \frac{11}{15} \\ a* \frac{2*14}{3*13}= \frac{11}{15} \\ a* \frac{28}{39} = \frac{11}{15} \\ a= \frac{11}{15}:\frac{28}{39} \\ a= \frac{11}{15} * \frac{39}{28} \\ a= \frac{11*39}{15*28} \\ a= \frac{429}{420} \\ a= \frac{429:3}{420:3} \\ a= \frac{143}{140} [/tex]