Answer:
x=18
Step-by-step explanation:
They are on a straight line which means they add to 180 and a more precise term, they form a supplementary angle
so knowing that we apply the principal
(8x-20) + (3x+2)=180
8x-20+3x+2=180
8x+3x=180+20-2
11x/11=198/11
x=18
Therefore x=18
