Quadrilateral ABCD is shown. Quadrilateral A B C D . Side A B has a length 2 y plus x, side B C has length 5 x plus 4 y, side C D has length 3 y plus 5, and side D A has length 7 x minus 2. Angle A B C has measure 55 a minus 3 degrees and opposite angle C D A has measure 4 a plus 9 degrees.

What must m∠BCD be for ABCD to be a parallelogram?
Group of answer choices

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57

123