Answer:
21 degrees ( answer no listed- could there be a typo in the question?)
Step-by-step explanation:
< 1 and < 7 are alternate exterior angles so by definition the angles are equal to each other.
< 1 = < 7
3x + 18 = 2x + 39
combine like terms (subtract 2x from both sides)
x + 18 = 39
subtract 18 from both sides
x = 21
