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Answer :

the sum of all interior angles of a polygon:
(number of sides - 2) 180
this is a hexagon so (6-2) 180 = 720
all these angles must have a sum of 720

95 + 120 + 120 + 172 + 125 + x = 720
632 + x = 720
x = 720 - 632
x = 88