Which manipulations to this equation maintain its balance? 3x + 3 = 12
Drag each tile to the correct location on the table.
For help, see this worked example C.
Balanced
Not Balanced

You didn’t put the necessary image to solve the question : p

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.