I don't like algebra pretending to be geometry. These are supplementary angles, adding to 180 degrees, geometry done.
We'll assume the units on the 2 and 8 are degrees.
(x + 8) + (3x + 2) = 180
4x + 10 = 180
4x = 170
x = 170/4 = 85/2 = 42.5 degrees
The first angle is x+8 = 50.5 degrees
The second angle is 3x+2=129.5 degrees