I do not understand how to find Q

Answer:
50
Step-by-step explanation:
You can use that sum of the opposite interior angles is equal to that exterior one.
So (30)+(4x+2)=8+6x
Combine like terms on left
32+4x=8+6x
Subtract 4x on both sides
32=8+2x
Subtract 8 on both sides
24=2x
So x=12
To find Q replace x in 4x+2 with 12 giving you 4(12)+2=48+2=50
just to add to the great reply above
Check the picture below.
Q = 4(12) + 2 = 50.