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=>
The two triangles are similar since they have the same angles. Consequently, each pair of corresponding sides is in the same proportion: \(39:3 = (18+x):x.\)
Rearranging this proportion yields
\(39x = 3(18+x)\)
\(39x = 3*18 + 3x\)
\(36x = 54\)
\(x = 1.5\)

Therefore, A is the answer.

Answer: A
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