Ithink i got the answer but i'm not sure. ?

I wish I could see your answer in the picture.  Then we could put it into the original equation and see if it checks.

It won't, because you made a slight mistake in your first line, where you were
eliminating the parentheses on the right side:

         -4(x- 3) = -4x +12 . . . . .  not -4x -12 .

That should get you all fixed up.

When you combine like terms from your first line,
your second line will be
                                         4x + 6 = 30 - 4x

and it's all smooth sailing from there.