Find YZ.
X 2x + 3
27-
Y
3x - 1
N

===============================================
Explanation:
The two pieces XY and YZ add to segment XZ
XY + YZ = XZ
(2x+3) + (3x-1) = 27
2x+3 + 3x-1 = 27
(2x+3x) + (3-1) = 27
5x+2 = 27
5x = 27-2
5x = 25
x = 25/5
x = 5
Then,
As a check: XY + YZ = 13+14 = 27 which confirms the answer.