can some one help me with this question. I need to know the value of "x" but I can't figure it out.

Answer:
4x = 80 degrees
3x = 60 degrees
2x = 40 degrees
Step-by-step explanation:
A straight line is 180 degrees
4x+3x+2x=180 degrees
9x=180 degrees so
180 divided by 9=20
x=20
4 times 20 = 80
3 times 20 = 60
2 times 20 = 40
to know you got it right, it all adds up to 180 degrees