Respuesta :

gmany
[tex]m\angle GHJ=180^o-156^o=24^o\\\\m\angle EFH=m\angle FHJ\\\\therefore\\\\2x=x+24^o\ \ \ |-x\\\\\boxed{x=24^o}[/tex]
m < JHG = 180 - 156 = 24 degrees
m < HGF = 24 degrees also ( alternate angles)
By external angle of a triangle theorem:-
2x = x + 24
x = 24   (answer)

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