find the missing angle measurement

Answer: 56
Step-by-step explanation: According to AIA(Alternate Interior Angles Congruency) they are equal. So just solve the equation that they're both equal to each other and you get x=-6. Plug this back in to find the angle measure, 56! Hope this helped!
Answer:
x = -6
56 degrees
Step-by-step explanation:
Those two angles that are labeled are equal for a reason that I forgot (but trust me they are). So, -8x+8 = -6x+20
just solve the equation to get x = -6
after plugging in -6 for x, you get that the angles that are labeled are 56 degrees.