Divide both side by 2 ad you get x=80
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Sum of the interior angles of any triangle is 180° .
Thus ;


Subtract sides 138°


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We can name an angle either by naming its vertex or by three letters , keeping the letter of vertex in between.
so here vertex is F
we can name it as ∠EFG, ∠F , ∠GFE
This strikes out the option B that is ∠G
so option B is the answer