Answer:
x=75
Explanation:
Okay so the sum of the angles inside this figure is
(6-2)*180=4*180=720
now, we can find 4 of the interior angles becuase they are supplementry.
180-54=126
180-51=129
There are two of each so we can just do 2(126)+2(129)=252+258=510
That means the two remaining angles that are supplementary to x equal to 510. they are equal, so we know the interior angles equal 720-510=210/2=105
Since the angles are supplementary, x=180-105=75
BTW: Supplementary angles are angles that equal to 180 degrees.