Determine values for which a quadrilateral is a parallelogram, math homework help

  

For what value of x must ABCD be a parallelogram?A four-sided figure ABCD has two horizontal sides and two vertical sides. A diagonal rises from vertex A to vertex C. Angles B and D are right angles. The angle at vertex A above the diagonal has a measure of(18x+5)° . The angle at vertex C below the diagonal has a measure of(21x−7)°x=

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