The 2 small lines that cross through the sides of the triangle mean that the 2 sides are the same length.
Because the sides are the same length the 2 angles at the bottom of the triangle would also be the same, since one is given as 56 degrees, the other bottom angle is also 56 degrees.
The 3 inside angles need to equal 180 degrees, so X would equal 180 - 56 - 56.
180 - 56 - 56 = 68
The answer is 68 degrees.
