Assuming this is an Isosceles Triangle, You would basically just find the X value that would make the 2 lines an equal length, otherwise one would be uneven therefore making it non-tangent.
But for this problem your 2 values are (2x-2), and (X+8).
For this problem the X value would be equal to 10.
This is because 2x(20)-2=18, and X(10)+8=18
-I hope this is the answer you are looking for, please feel free to post your questions here on brainly in the future.