Triangle MNO is dilated by a scale factor of 7/8 to create triangle M'N'O'.
The perimeter of triangle MNO is x units.
What is the perimeter in units of triangle M'N'O'?
Since the scale factor is 7/8, each side of triangle MNO is multiplied by 7/8 to get the corresponding side of triangle M'N'O'.
Therefore, the perimeter of triangle M'N'O' is (7/8)x units.