I don't speak Spanish.

f(x) = (3x + 1)/(6x - 2) = (6x - 2 - 3x + 3)/(6x - 2)

= 1 - 3(x - 1)/(6x - 2)

= 1 - 3(x - 1/3 - 2/3)/(6x - 2)

= 1 - 3(x - 1/3)/6(x - 1/3) + 2/(6x - 2)

= 1 - 1/2 + 2/(2(3x - 1))

= 1/2 + 1/(3x - 1)

k = 1/2, a = 1/3, h = 1/3