Answer:
4
Step-by-step explanation:
Alternate exterior angles have the same measure, so
... ∠2 = ∠7
... 3x +2 = x +10 . . . . . substitute the given expressions for the angle measures
... 2x +2 = 10 . . . . . . . .subtract x
... x +1 = 5 . . . . . . . . . . divide by 2
... x = 4 . . . . . . . . . . . . subtract 1