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9514 1404 393
Answer:
Step-by-step explanation:
Since A is the midpoint of XY, we have XA = AY:
9x = 12x -15
15 = 3x
5 = x
XA = 9x = 45
AY = 12x -15 = 60 -15 = 45
XY = 45 +45 = 90