Answer:
127
Explanation:
∡b = 53°
∡d = 127°
∡c = 127°
in trapezoids, the two top angles are equal and the two bottom are equal
also, there are 360 degrees in any 4-sided polygon
53 + 53 + x + x = 360
2x + 106 = 360
2x = 254
x = 127
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