What does it mean if 6x = 6x as an answer to an equation

Step-by-step explanation:

It means that x can have any value and still be true. There is not an exception to this rule except perhaps + / - infinity or zero which can always cause trouble. But in general the value of x is anything at all.

Usually you want x to be a single number. In this case it is not and something has gone wrong.

It means that the two equations are equal to each other and that the answer is correct.