The perimeter of a triangle is 17 x − 5 units. One side is 3 x + 5 units and another is 8 x − 3 units. How many units long is the third side? 6 x − 7 6 x − 7 6 x − 13 6 x − 13 12 x − 7 12 x − 7 22 x − 23