Answer: The correct option is (a) always.
Step-by-step explanation: We are given to decide whether the following equation is always true, sometimes true or never true :

To check the given equation, we must try to simplify the equation.
From equation (i), we have

Since the result 0 = 0 is always true, so whatever be the value of x, the given equation is always true.
Option (a) is CORRECT.