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Answer:
x = 8
Explanation:
AB/AC = BD/DC
2x/12 = x+4/x+1
12x + 4 = 2x² + 2x
2x² - 10x - 48 = 0
x² - 5x - 24 = 0
(x-8) (x+3) = 0
x = 8 (or) x= -3 (impossible)
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