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Answer:
u=5.23
Step-by-step explanation:

3x-9 would equal 3(x-3) because you factor the 3 out of the 9.
Answer: See below
Explanation:
8x + 14 = 10x - 10 (alt. exterior angle)
8x - 10x = -10 - 14
-2x = -24
x = -24/-2
x = 12
Now plug x = 12 in 10x - 10 to find the angle:
10(12) - 10 = 120 - 10 = 110 degree