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Llamemos "x" al número que se suma/resta, el reciproco de 3/5 es 5/3, entonces
(3 + x)/(5 - x) = 5/3
3 + x = 5/3 * (5 - x)
3 + x = 25/3 - 5/3 x
x + 5/3 x = 25/3 - 3
8/3 x = 16/3
x = 16/3 / 8/3
x = 2
R/ El número es 2.
Prueba
(3 + 2)/(5 - 2) = 5/3