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Sea "x" la cantidad de años buscada:
(1/4)(12a+8) = (12a+8) - x
3a + 2 = 12a + 8 - x
x = (12a - 3a) + (8-2)
x = 9a + 6
Rpta: Alternativa d) 9a + 6
Saludos! Jeizon1L