2 answers:
X=109
The polygon has 5 sides which makes it a pentagon
The sum of all of the angles of a pentagon equal 540 degrees.
Add all given angles (431 degrees)
Subtract 431 from 540 and you will get 109 which is X
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245= 5*7*7 :) so 5 and 7 are prime factors of 245 :)
5 and 6 both go into 30
4/5= 24/30
1/6= 5/30
24/30-5/30= 19/30