Answer:
The inequality which is equivalent to the given inequality is:
D.

Explanation:
We are given a inequality as:

which on simplifying gives.
i.e. on adding 8 on both side of the inequality we get:

A)

on simplifying we gets:

which does not matches the actual inequality.
Hence, option: A is incorrect.
B)

on solving we get:

which is not equivalent to the given inequality.
Hence, option: B is incorrect.
C)

on simplifying we get:

Now on adding both side of the inequality by 6 we get:

which again does not matches.
Hence, option: C is incorrect.
D)

on simplifying we get:

It matches the actual expression.
Hence, option: D is correct.