A solution to simplify a given Boolean expression (with don't cares) using the Quine McCluskey method has been discussed in this video. There is a small mistake in the question. Please change the question to (0,1,2,3,9,12) + dc(4,5,6). I've used 1100 instead of 1010. As there is no annotation option available, I couldn't edit it. Sorry for the inconvenience. The rest of the answer is correct. Just change the question to the one I have shown here.