\"\"

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Since ABCD is a rhombus, all sides are congruent.

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\"\"                (In a rhombus all sides are congruent)

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\"\"                (Definition of congruent segments)

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\"\"          (Substitute \"\")

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\"\"                   (Subtract 2x from each side) \"\"                     (Divide each side by 3)\"\"

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The value of x is 1.