Question

Va rog ajutatimaa.....repede

Answer 1

x*2/3 *14/13=11/15
x*28/39=11/15
x=11/15 : 28/39
x=11/15 * 39/28
x=11/5* 13/28
x=143/140

Answer 2

$\displaystyle a \cdot \frac{2}{3} \cdot \frac{14}{13} = \frac{11}{15} \\ \\ a \cdot \frac{28}{39} = \frac{11}{15} \\ \\ a= \frac{11}{15} : \frac{28}{39} \\ \\ a= \frac{11}{15} \cdot \frac{39}{28} \\ \\ a= \frac{429}{420} ^{(3} \\ \\ a= \frac{143}{140}$