Question

Answer to the question

Answer 1

7

Explanation:

Step-by-step explanation:

AB//CD (Opposite sides of parallelogram are parallel)

Angle A + Angle B = 180 (Sum of interior angles=180)

179 + 3x - 20 = 180

3x - 20 = 180 - 179

3x - 20 = 1

3x = 1 + 20

3x = 21

x = 21/3

x = 7