Answer:
Given that
(5a+6 )°+90°+(7a)°=180°
(angles on a straight line sum up to 180°)
5a°+6°+90°+7a°=180°
5a°+7a°=(180-96)°
12a°=84°
Deviding both sides by 12° gives
a=84/12
a=7°
therefore the value of
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