Question 333245
Since all three sides are not the same length, we are dealing with a scalene triangle.  

The formula for finding the perimeter of a scalene triangle is given by 
P = side a + side b + side c.

Let side a = x + 4

Let side b = x

Let side c = (x + 4) - 5

Let P = 28

28 = x + 4 + x + [x + 4 - 5]

I'll let you take it from here.