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Your answer is :-
The 3 given angles are summing up to 180 as
it is forming a straight angle.
. (6x-40)° + (5x +9)° +(3x+15)° =180°
(14x-40+9+15)° =180°
(14x-16)° =180°
14x = 180° +16°
14x = 196°
X=14°
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