Answer:
15
Explanation:
AB=AC
x + 7 = 2x - 1
8 = x
now you plug in 8 for x in the equation for line AB
(8) + 7 = 15
AB is equal to AC
so x + 7 = 2x - 1
then simplify
7 = x - 1
x = 8
plug it back into AB
8 + 7 = 15
so AB is 15
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