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1/9 - x= 2/5 x=13/45 es lo que le falta
Ahora 3 1/3 = 10/3 se lo sacamos así
(10/3)(y)=13/45 y=13/45 / (10/3)
y=39/450 simplificando 13/150 esa es la parte que le sacamos 10/3
10/3.13/150=13/45 :1/9+13/45=2/5