6y - 12 = a) 6y - 12y - 12 b) 3y + 3y - 12 c) 6y + 6y -12 d) 12y - 6 - 6

The answer would be 3y + 3y - 12:

All you would have to do is add the common variables together (y)

3y + 3y = 6y

6y - 12

Wrong answers:

6y - 12y - 12 = –6y - 12

6y + 6y - 12 = 12y - 12

12y - 6 - 6 = 12y - 12

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