Answer:
x = 20
Step-by-step explanation:
(3x + 20°) + 5x = 180°
8x + 20 = 180°
8x = 160°
x = 160/8
[tex]3x + 20 + 5x = 180 \\ 8x + 20 = 180 \\ 8x = 180 - 20 \\ 8x = 160 \\ \\ x = \frac{160}{8} \\ \\ x = 20[/tex]
I hope I helped you^_^
